CVE-2024-37891

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When using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib3's proxy support, it's possible to accidentally configure the `Proxy-Authorization` header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident. Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the `Proxy-Authorization` header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach. We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited: 1. Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support. 2. Not disabling HTTP redirects. 3. Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin. Users are advised to update to either version 1.26.19 or version 2.2.2. Users unable to upgrade may use the `Proxy-Authorization` header with urllib3's `ProxyManager`, disable HTTP redirects using `redirects=False` when sending requests, or not user the `Proxy-Authorization` header as mitigations."}], "source": {"advisory": "GHSA-34jh-p97f-mpxf", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-06-18T13:49:45.845349Z", "id": "CVE-2024-37891", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-18T13:49:57.293Z"}}, {"title": "CVE Program Container", "references": [{"name": "https://github.com/urllib3/urllib3/security/advisories/GHSA-34jh-p97f-mpxf", "tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-34jh-p97f-mpxf"}, {"name": "https://github.com/urllib3/urllib3/commit/accff72ecc2f6cf5a76d9570198a93ac7c90270e", "tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/urllib3/urllib3/commit/accff72ecc2f6cf5a76d9570198a93ac7c90270e"}, {"url": "https://www.vicarius.io/vsociety/posts/proxy-authorization-header-handling-vulnerability-in-urllib3-cve-2024-37891"}, {"url": "https://security.netapp.com/advisory/ntap-20240822-0003/"}, {"url": "https://lists.debian.org/debian-lts-announce/2024/12/msg00020.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T21:55:35.021Z"}}]}}

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When using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib3's proxy support, it's possible to accidentally configure the `Proxy-Authorization` header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident. Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the `Proxy-Authorization` header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach. We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited: 1. Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support. 2. Not disabling HTTP redirects. 3. Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin. Users are advised to update to either version 1.26.19 or version 2.2.2. Users unable to upgrade may use the `Proxy-Authorization` header with urllib3's `ProxyManager`, disable HTTP redirects using `redirects=False` when sending requests, or not user the `Proxy-Authorization` header as mitigations."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-669", "description": "CWE-669: Incorrect Resource Transfer Between Spheres"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2024-06-17T19:18:32.574Z"}}}, "cveMetadata": {"cveId": "CVE-2024-37891", "state": "PUBLISHED", "dateUpdated": "2025-11-03T21:55:35.021Z", "dateReserved": "2024-06-10T19:54:41.361Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2024-06-17T19:18:32.574Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

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When using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib3's proxy support, it's possible to accidentally configure the `Proxy-Authorization` header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident. Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the `Proxy-Authorization` header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach. We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited: 1. Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support. 2. Not disabling HTTP redirects. 3. Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin. Users are advised to update to either version 1.26.19 or version 2.2.2. Users unable to upgrade may use the `Proxy-Authorization` header with urllib3's `ProxyManager`, disable HTTP redirects using `redirects=False` when sending requests, or not user the `Proxy-Authorization` header as mitigations."}, {"lang": "es", "value": "urllib3 es una librer\u00eda cliente HTTP f\u00e1cil de usar para Python. Cuando se utiliza el soporte de proxy de urllib3 con `ProxyManager`, el encabezado `Proxy-Authorization` solo se env\u00eda al proxy configurado, como se esperaba. Sin embargo, al enviar solicitudes HTTP *sin* utilizar el soporte de proxy de urllib3, es posible configurar accidentalmente el encabezado `Proxy-Authorization` aunque no tendr\u00e1 ning\u00fan efecto ya que la solicitud no utiliza un proxy de reenv\u00edo o un proxy de t\u00fanel. En esos casos, urllib3 no trata el encabezado HTTP \"Proxy-Authorization\" como si llevara material de autenticaci\u00f3n y, por lo tanto, no elimina el encabezado en redirecciones de origen cruzado. Dado que se trata de un escenario muy improbable, creemos que la gravedad de esta vulnerabilidad es baja para casi todos los usuarios. Por precauci\u00f3n, urllib3 eliminar\u00e1 autom\u00e1ticamente el encabezado \"Proxy-Authorization\" durante las redirecciones entre or\u00edgenes para evitar la peque\u00f1a posibilidad de que los usuarios hagan esto por accidente. Los usuarios deben usar el soporte de proxy de urllib3 o desactivar las redirecciones autom\u00e1ticas para lograr un procesamiento seguro del encabezado `Proxy-Authorization`, pero aun as\u00ed decidimos eliminar el encabezado de forma predeterminada para proteger a\u00fan m\u00e1s a los usuarios que no utilizan el enfoque correcto. Creemos que la cantidad de usos afectados por este aviso es baja. Requiere que todo lo siguiente sea cierto para ser explotado: 1. Configurar el encabezado `Proxy-Authorization` sin utilizar el soporte de proxy integrado de urllib3. 2. No deshabilitar las redirecciones HTTP. 3. Ya sea no utilizar un servidor de origen HTTPS o que el proxy o el origen de destino redirija a un origen malicioso. Se recomienda a los usuarios que actualicen a la versi\u00f3n 1.26.19 o a la versi\u00f3n 2.2.2. Los usuarios que no puedan actualizar pueden usar el encabezado `Proxy-Authorization` con `ProxyManager` de urllib3, deshabilitar las redirecciones HTTP usando `redirects=False` al enviar solicitudes o no usar el encabezado `Proxy-Authorization` como mitigaci\u00f3n."}], "id": "CVE-2024-37891", "lastModified": "2026-06-17T07:38:59.980", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 0.7, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-37891", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-18T13:49:45.845349Z", "version": "2.0.3"}}]}, "published": "2024-06-17T20:15:13.450", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/urllib3/urllib3/commit/accff72ecc2f6cf5a76d9570198a93ac7c90270e"}, {"source": "security-advisories@github.com", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-34jh-p97f-mpxf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/urllib3/urllib3/commit/accff72ecc2f6cf5a76d9570198a93ac7c90270e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-34jh-p97f-mpxf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2024/12/msg00020.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20240822-0003/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "url": "https://www.vicarius.io/vsociety/posts/proxy-authorization-header-handling-vulnerability-in-urllib3-cve-2024-37891"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-669"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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"2024-11-19T00:00:00Z"}, {"advisory": "RHSA-2024:9985", "cpe": "cpe:/a:redhat:openstack:17.1::el8", "package": "python-urllib3-0:1.25.10-7.el8ost", "product_name": "Red Hat OpenStack Platform 17.1 for RHEL 8", "release_date": "2024-11-21T00:00:00Z"}, {"advisory": "RHSA-2024:8906", "cpe": "cpe:/a:redhat:satellite:6.16::el8", "package": "python-urllib3-0:2.2.3-1.el8pc", "product_name": "Red Hat Satellite 6.16 for RHEL 8", "release_date": "2024-11-05T00:00:00Z"}, {"advisory": "RHSA-2024:8906", "cpe": "cpe:/a:redhat:satellite_capsule:6.16::el8", "package": "python-urllib3-0:2.2.3-1.el8pc", "product_name": "Red Hat Satellite 6.16 for RHEL 8", "release_date": "2024-11-05T00:00:00Z"}, {"advisory": "RHSA-2024:8906", "cpe": "cpe:/a:redhat:satellite:6.16::el9", "package": "python-urllib3-0:2.2.3-1.el9pc", "product_name": "Red Hat Satellite 6.16 for RHEL 9", "release_date": "2024-11-05T00:00:00Z"}, {"advisory": "RHSA-2024:8906", "cpe": "cpe:/a:redhat:satellite_capsule:6.16::el9", "package": "python-urllib3-0:2.2.3-1.el9pc", "product_name": "Red Hat Satellite 6.16 for RHEL 9", "release_date": "2024-11-05T00:00:00Z"}], "bugzilla": {"description": "urllib3: proxy-authorization request header is not stripped during cross-origin redirects", "id": "2292788", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2292788"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-669", "details": ["urllib3 is a user-friendly HTTP client library for Python. When using urllib3's proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib3's proxy support, it's possible to accidentally configure the `Proxy-Authorization` header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident. Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the `Proxy-Authorization` header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach. We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited: 1. Setting the `Proxy-Authorization` header without using urllib3's built-in proxy support. 2. Not disabling HTTP redirects. 3. Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin. Users are advised to update to either version 1.26.19 or version 2.2.2. Users unable to upgrade may use the `Proxy-Authorization` header with urllib3's `ProxyManager`, disable HTTP redirects using `redirects=False` when sending requests, or not user the `Proxy-Authorization` header as mitigations.", "A flaw was found in urllib3, an HTTP client library for Python. In certain configurations, urllib3 does not treat the `Proxy-Authorization` HTTP header as one carrying authentication material. This issue results in not stripping the header on cross-origin redirects."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-37891", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform", "fix_state": "Out of support scope", "package_name": "ansible-tower", "product_name": "Red Hat Ansible Automation Platform 1.2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-24/ee-minimal-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-25/lightspeed-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-lint", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "ansible-navigator", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "python3x-ansible-compat", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Not affected", "package_name": "python-ansible-compat", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:discovery:1", "fix_state": "Not affected", "package_name": "discovery-server-container", "product_name": "Red Hat Discovery 1"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "python-pip", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "python-tornado", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "python-urllib3", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "python-pip", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "python-s3transfer", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "python-urllib3", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "resource-agents", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "container-tools:rhel8/python-podman", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "gimp:flatpak/python2-pip", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "inkscape:flatpak/python2-pip", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python27:2.7/python2-pip", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python3.11-pip", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python3.12-pip", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python39:3.9/python3x-pip", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "python-pip", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "python3.11-pip", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "python3.12-pip", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "python-pip", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:3.11", "fix_state": "Out of support scope", "package_name": "openvswitch-ovn-kubernetes", "product_name": "Red Hat OpenShift Container Platform 3.11"}, {"cpe": "cpe:/a:redhat:openshift:3.11", "fix_state": "Out of support scope", "package_name": "python-urllib3", "product_name": "Red Hat OpenShift Container Platform 3.11"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Will not fix", "package_name": "openshift4/baremetal-hardware-event-proxy-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ztp-site-generate-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift_data_science", "fix_state": "Will not fix", "package_name": "rhods/odh-ml-pipelines-cache-rhel8", "product_name": "Red Hat OpenShift Data Science (RHODS)"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Affected", "package_name": "rh-python38-python-pip", "product_name": "Red Hat Software Collections"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Affected", "package_name": "rh-python38-python-urllib3", "product_name": "Red Hat Software Collections"}, {"cpe": "cpe:/a:redhat:storage:3", "fix_state": "Affected", "package_name": "graphite-web", "product_name": "Red Hat Storage 3"}], "public_date": "2024-06-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-37891\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-37891"], "statement": ".egg-info packages, like urllib3-1.24.2-py3.6.egg-info, store only metadata such as package version and dependencies and do not contain any affected codebase.", "threat_severity": "Moderate"}

{}