CVE-2026-12372

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{"affected": [{"affectedData": [{"product": "nltk/nltk", "vendor": "nltk", "versions": [{"lessThanOrEqual": "latest", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@huntr.dev"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:nltk:nltk:3.9.4:*:*:*:*:*:*:*", "matchCriteriaId": "E0F7C7D0-ADBA-409B-9E84-D8C569B4BFB2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch. The `nltk.pathsec.validate_network_url()` function, intended to prevent SSRF by rejecting internal network addresses, fails to reject IPs in the RFC 6598 shared address space (`100.64.0.0/10`). This occurs because Python's `ipaddress` module does not classify such addresses as `is_private` or `is_global`, and the current guard only checks `is_private` and a few explicit categories. An attacker who can influence a URL passed to NLTK's network-loading helpers can exploit this vulnerability to make a strict-mode application send requests to shared-address-space hosts, potentially exposing non-public infrastructure reachable from the application host. The impact is limited to SSRF-style confidentiality exposure, with no code execution claimed."}, {"lang": "es", "value": "Una vulnerabilidad de falsificaci\u00f3n de petici\u00f3n del lado del servidor (SSRF) existe en las versiones 3.9.4 de nltk/nltk y en la rama de desarrollo actual. La funci\u00f3n \u2019nltk.pathsec.validate_network_url()\u2019, destinada a prevenir SSRF al rechazar direcciones de red internas, no logra rechazar IPs en el espacio de direcciones compartidas RFC 6598 (\u2019100.64.0.0/10\u2019). Esto ocurre porque el m\u00f3dulo \u2019ipaddress\u2019 de Python no clasifica dichas direcciones como \u2019is_private\u2019 o \u2019is_global\u2019, y la protecci\u00f3n actual solo verifica \u2019is_private\u2019 y algunas categor\u00edas expl\u00edcitas. Un atacante que puede influir en una URL pasada a las funciones de ayuda de carga de red de NLTK puede explotar esta vulnerabilidad para hacer que una aplicaci\u00f3n en modo estricto env\u00ede peticiones a hosts del espacio de direcciones compartidas, exponiendo potencialmente infraestructura no p\u00fablica accesible desde el host de la aplicaci\u00f3n. El impacto se limita a la exposici\u00f3n de confidencialidad de tipo SSRF, sin ejecuci\u00f3n de c\u00f3digo reclamada."}], "id": "CVE-2026-12372", "lastModified": "2026-10-23T20:10:00.160", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "security@huntr.dev", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12372", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-12T17:45:59.173613Z", "version": "2.0.3"}}]}, "published": "2026-08-09T23:16:35.793", "references": [{"source": "security@huntr.dev", "tags": ["Permissions Required"], "url": "https://huntr.com/bounties/2911b643-571c-42e4-b0c2-9a1fa6f491db"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Permissions Required"], "url": "https://huntr.com/bounties/2911b643-571c-42e4-b0c2-9a1fa6f491db"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "security@huntr.dev", "type": "Secondary"}]}

{"bugzilla": {"description": "nltk: NLTK: Server-Side Request Forgery via improper network URL validation", "id": "2513003", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513003"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-918", "details": ["A flaw was found in NLTK. A Server-Side Request Forgery (SSRF) vulnerability allows an attacker to influence a URL passed to NLTK's network-loading helpers. This occurs because the `nltk.pathsec.validate_network_url()` function fails to properly identify and reject IP addresses within the RFC 6598 shared address space (100.64.0.0/10). This could lead to the exposure of non-public infrastructure reachable from the application host, resulting in confidentiality exposure."], "name": "CVE-2026-12372", "package_state": [{"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Out of support scope", "package_name": "exploit-intelligence-tech-preview/vulnerability-analysis-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/lightspeed-stack-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/rag-tool-cpu-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "lightspeed-core/rag-tool-cuda-12.9-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-ocp-rag-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed/lightspeed-service-api-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Fix deferred", "package_name": "openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Out of support scope", "package_name": "ansible-automation-platform-25/lightspeed-chatbot-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-llama-stack-core-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-ta-lmes-job-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-trustyai-nemo-guardrails-server-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-08-09T22:45:52Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-12372\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-12372\nhttps://huntr.com/bounties/2911b643-571c-42e4-b0c2-9a1fa6f491db"], "threat_severity": "Low"}

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