CVE-2026-12252

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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:*:*:*:*:*:*:*:*", "matchCriteriaId": "E3C35863-7D82-4EEF-BDE8-E94C559CF4FB", "versionEndIncluding": "3.9.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser, and StanfordNeuralDependencyParser) are vulnerable to untrusted JAR code execution. These classes accept user-controllable JAR paths and execute them via the `java()` function, which invokes `subprocess.Popen()` without integrity verification. This vulnerability is identical to CVE-2026-0848, which was fixed for StanfordSegmenter by adding SHA256 verification. However, the fix was not applied to these additional classes, leaving them susceptible to arbitrary code execution when loading untrusted JAR files."}, {"lang": "es", "value": "En las versiones 3.9.3 y anteriores de nltk/nltk, cinco clases de interfaz de Stanford (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser y StanfordNeuralDependencyParser) son vulnerables a la ejecuci\u00f3n de c\u00f3digo JAR no confiable. Estas clases aceptan rutas JAR controlables por el usuario y las ejecutan a trav\u00e9s de la funci\u00f3n \u2019java()\u2019, que invoca a \u2019subprocess.Popen()\u2019 sin verificaci\u00f3n de integridad. Esta vulnerabilidad es id\u00e9ntica a CVE-2026-0848, que fue corregida para StanfordSegmenter mediante la adici\u00f3n de verificaci\u00f3n SHA256. Sin embargo, la correcci\u00f3n no se aplic\u00f3 a estas clases adicionales, dej\u00e1ndolas susceptibles a la ejecuci\u00f3n de c\u00f3digo arbitrario al cargar archivos JAR no confiables."}], "id": "CVE-2026-12252", "lastModified": "2026-10-25T15:10:00.147", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.0"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security@huntr.dev", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-12252", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-06T18:32:42.979501Z", "version": "2.0.3"}}]}, "published": "2026-07-04T02:16:23.603", "references": [{"source": "security@huntr.dev", "tags": ["Exploit", "Third Party Advisory"], "url": "https://huntr.com/bounties/f5c93982-0cc9-4e2e-bb85-1b6ab29a2efb"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"], "url": "https://huntr.com/bounties/f5c93982-0cc9-4e2e-bb85-1b6ab29a2efb"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-94"}], "source": "security@huntr.dev", "type": "Secondary"}]}

{"bugzilla": {"description": "nltk: nltk: Arbitrary Code Execution via Untrusted JAR File Loading", "id": "2496984", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496984"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-347", "details": ["In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger, StanfordParser, StanfordDependencyParser, and StanfordNeuralDependencyParser) are vulnerable to untrusted JAR code execution. These classes accept user-controllable JAR paths and execute them via the `java()` function, which invokes `subprocess.Popen()` without integrity verification. This vulnerability is identical to CVE-2026-0848, which was fixed for StanfordSegmenter by adding SHA256 verification. However, the fix was not applied to these additional classes, leaving them susceptible to arbitrary code execution when loading untrusted JAR files.", "A flaw was found in the `nltk` library. Several Stanford interface classes within `nltk` are susceptible to arbitrary code execution. This vulnerability allows a local attacker to execute malicious code by providing an untrusted Java Archive (JAR) file, as the system lacks integrity verification for these files."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, users should ensure that only trusted Java Archive (JAR) files are processed by the `nltk` Stanford interface classes. Avoid loading JAR files from untrusted sources, as this vulnerability allows for arbitrary code execution. Implement strict input validation and source verification for any JAR files used with `nltk` to prevent the execution of malicious code."}, "name": "CVE-2026-12252", "package_state": [{"cpe": "cpe:/a:redhat:exploit_intelligence:0", "fix_state": "Under investigation", "package_name": "exploit-intelligence-tech-preview/vulnerability-analysis-rhel9", "product_name": "Exploit Intelligence"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Under investigation", "package_name": "lightspeed-core/lightspeed-stack-rhel9", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Affected", "package_name": "openshift-lightspeed/lightspeed-ocp-rag-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Affected", "package_name": "openshift-lightspeed/lightspeed-service-api-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Affected", "package_name": "openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Under investigation", "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": "Not affected", "package_name": "rhoai/odh-llama-stack-core-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "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": "Not affected", "package_name": "rhoai/odh-ta-lmes-job-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "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": "Not affected", "package_name": "rhoai/odh-trustyai-nemo-guardrails-server-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Not affected", "package_name": "rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-07-04T00:58:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-12252\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-12252\nhttps://huntr.com/bounties/f5c93982-0cc9-4e2e-bb85-1b6ab29a2efb"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.9.3]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "nltk/nltk", "source": "cna", "vendor": "nltk"}, "product": "nltk/nltk", "vendor": "nltk"}], "created": "2026-07-04T04:15:03.032048+00:00", "updated": "2026-08-01T20:00:07.330143+00:00", "vendors": ["nltk", "nltk$PRODUCT$nltk/nltk"]}