CVE-2026-27459

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Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected."}], "source": {"advisory": "GHSA-5pwr-322w-8jr4", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-18T19:52:08.536876Z", "id": "CVE-2026-27459", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-18T19:52:15.812Z"}}, {"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:ansible_automation_platform:2.5::el8"], "defaultStatus": "affected", "packageName": "python3.12-pyOpenSSL", "product": "Red Hat Ansible Automation Platform 2.5 for RHEL 8", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "0:26.0.0-1.el8ap", 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Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected."}, {"lang": "es", "value": "pyOpenSSL es un envoltorio de Python para la biblioteca OpenSSL. A partir de la versi\u00f3n 22.0.0 y antes de la versi\u00f3n 26.0.0, si una devoluci\u00f3n de llamada proporcionada por el usuario a set_cookie_generate_callback devolv\u00eda un valor de cookie superior a 256 bytes, pyOpenSSL desbordar\u00eda un b\u00fafer proporcionado por OpenSSL. A partir de la versi\u00f3n 26.0.0, los valores de cookie que son demasiado largos ahora son rechazados."}], "id": "CVE-2026-27459", "lastModified": "2026-09-10T13:17:59.900", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": 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{"bugzilla": {"description": "pyOpenSSL: DTLS cookie callback buffer overflow", "id": "2448503", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448503"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-120", "details": ["A flaw was found in pyOpenSSL. The set_cookie_generate_callback callback function can be used to generate DTLS cookies. When the callback returns a cookie string or byte sequence longer than 256 bytes, a buffer overflow can be triggered due to a missing bounds checking before copying the data to a fixed-size buffer provided by the underlying OpenSSL library."], "mitigation": {"lang": "en:us", "value": "To mitigate this flaw, ensure the callback provided to the set_cookie_generate_callback function strictly limits the returned cookie string or byte sequence to under 256 bytes."}, "name": "CVE-2026-27459", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Will not fix", "package_name": "ansible-automation-platform-24/lightspeed-rhel8", "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/ee-supported-rhel8", "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": "Affected", "package_name": "ansible-automation-platform-26/ansible-dev-tools-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-26/controller-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-26/eda-controller-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-26/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-26/ee-supported-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-26/hub-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-26/lightspeed-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-26/platform-resource-runner-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "automation-controller", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "python3.11-pyOpenSSL", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "python3.12-pyOpenSSL", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "python3x-pyOpenSSL", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "python-pyOpenSSL", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_core:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/ee-minimal-rhel8", "product_name": "Red Hat Ansible Automation Platform Ansible Core 2"}, {"cpe": "cpe:/a:redhat:ansible_core:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/ee-minimal-rhel9", "product_name": "Red Hat Ansible Automation Platform Ansible Core 2"}, {"cpe": "cpe:/a:redhat:ansible_core:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-tech-preview/ee-minimal-rhel8", "product_name": "Red Hat Ansible Automation Platform Ansible Core 2"}, {"cpe": "cpe:/a:redhat:ansible_core:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-tech-preview/ee-minimal-rhel9", "product_name": "Red Hat Ansible Automation Platform Ansible Core 2"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "pyOpenSSL", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "pyOpenSSL", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "pyOpenSSL", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-feature-server-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-mlflow-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "pyOpenSSL", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openstack:17.1", "fix_state": "Not affected", "package_name": "pyOpenSSL", "product_name": "Red Hat OpenStack Platform 17.1"}, {"cpe": "cpe:/a:redhat:openstack:18.0", "fix_state": "Not affected", "package_name": "pyOpenSSL", "product_name": "Red Hat OpenStack Platform 18.0"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel9", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "python3.12-pyOpenSSL", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "python-pyOpenSSL", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite-capsule:el8/python-pyOpenSSL", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "satellite:el8/python-pyOpenSSL", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite/iop-advisor-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite/iop-insights-engine-rhel9", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Affected", "package_name": "rhtas/model-transparency-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}, {"cpe": "cpe:/a:redhat:rhui:4::el8", "fix_state": "Affected", "package_name": "python-pyOpenSSL", "product_name": "Red Hat Update Infrastructure 4 for Cloud Providers"}], "public_date": "2026-03-17T23:34:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27459\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27459\nhttps://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst\nhttps://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408\nhttps://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4"], "statement": "This flaw is only exploitable when an application using the pyOpenSSL library provides a custom callback to the set_cookie_generate_callback function. For the buffer overflow to occur, the callback function must return a cookie string or byte sequence longer than 256 bytes, limiting the exposure of this issue. Due to these reasons, this vulnerability has been rated with an important severity.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[22.0.0,26.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "pyopenssl", "source": "cna", "vendor": "pyca"}, "product": "pyopenssl", "vendor": "pyca"}], "analysis": {"en": {"generated_at": "2026-03-23T19:53:40.858229+00:00", "value": {"mitigation_remediation": ["Upgrade pyOpenSSL to version 26.0.0 or later.", "If an upgrade is not immediately possible, modify any custom cookie callback to ensure it never returns a cookie longer than 256 bytes.", "Verify that no older pyOpenSSL versions remain in the environment and monitor for related errors."], "summary": {"action": "Immediate Patch", "impact": "Buffer Overflow"}, "threat_synthesis": {"affected_systems": "The affected product is pyOpenSSL, a Python wrapper maintained by the PyCA project, specifically versions 22.0.0 through 25.x. Any environment that imports pyOpenSSL and configures a DTLS cookie callback may be affected. Starting with version 26.0.0, the library rejects cookie values that exceed the 256\u2011byte limit, eliminating the risk.", "description_and_impact": "The flaw lies in the pyOpenSSL library's handling of DTLS cookie generation callbacks. When a callback returns a cookie longer than the expected 256 bytes, the library passes that oversized value to an OpenSSL buffer that cannot accommodate it, causing a buffer overflow. This overflow can corrupt adjacent memory, potentially leading to arbitrary code execution or other severe compromises. The weakness corresponds to the classic stack or heap overrun identified as CWE-120.", "risk_and_exploitability": "The CVSS score of 7.2 indicates a high severity rating, but the EPSS score of less than 1\u202f% suggests a low expected exploitation frequency at present. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector is remote, inferred from the description of a DTLS handshake that triggers the cookie callback. Exploitation would also require control over the callback implementation or the ability to supply malicious cookie data, which is inferred as a prerequisite."}}}}, "created": "2026-03-18T10:42:30.520219+00:00", "updated": "2026-03-24T10:54:19.028788+00:00", "vendors": ["pyca", "pyca$PRODUCT$pyopenssl"]}