CVE-2026-34070

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Prior to version 1.2.22, multiple functions in langchain_core.prompts.loading read files from paths embedded in deserialized config dicts without validating against directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to load_prompt() or load_prompt_from_config(), an attacker can read arbitrary files on the host filesystem, constrained only by file-extension checks (.txt for templates, .json/.yaml for examples). This issue has been patched in version 1.2.22."}, {"lang": "es", "value": "LangChain es un framework para construir agentes y aplicaciones impulsadas por LLM. Antes de la versi\u00f3n 1.2.22, m\u00faltiples funciones en langchain_core.prompts.loading le\u00edan archivos de rutas incrustadas en diccionarios de configuraci\u00f3n deserializados sin validar contra salto de directorio o inyecci\u00f3n de ruta absoluta. Cuando una aplicaci\u00f3n pasa configuraciones de prompt influenciadas por el usuario a load_prompt() o load_prompt_from_config(), un atacante puede leer archivos arbitrarios en el sistema de archivos del host, restringido solo por verificaciones de extensi\u00f3n de archivo (.txt para plantillas, .json/.yaml para ejemplos). Este problema ha sido parcheado en la versi\u00f3n 1.2.22."}], "id": "CVE-2026-34070", "lastModified": "2026-08-25T13:18:38.963", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34070", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-31T15:17:33.597003Z", "version": "2.0.3"}}]}, "published": "2026-03-31T03:15:58.947", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47c"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:24766"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:37275"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:59159"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-34070"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453287"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34070.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-22"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "langchain: path traversal in legacy load_prompt functions in langchain-core", "id": "2453287", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453287"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-22", "details": ["A flaw was found in LangChain. Multiple functions in `langchain_core.prompts.loading` read files from paths embedded in deserialized configuration dictionaries without validation for directory traversal or absolute path injection. When an application passes user-influenced prompt configurations to `load_prompt()` or `load_prompt_from_config()`, an attacker can read arbitrary files on the host filesystem."], "mitigation": {"lang": "en:us", "value": "As described in the statement section, the vulnerable methods are legacy APIs and their use should be avoided. To mitigate this issue, the dumpd, dumps, load and loads methods from langchain_core.load should be used, as they supersede the legacy API and provide a more secure serialization model."}, "name": "CVE-2026-34070", "package_state": [{"cpe": "cpe:/a:redhat:migration_toolkit_applications:8", "fix_state": "Affected", "package_name": "redhat-user-workloads/art-images", "product_name": "Migration Toolkit for Applications 8"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Affected", "package_name": "redhat-user-workloads/lightspeed-service", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "redhat-user-workloads/lightspeed-chatbot-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "redhat-user-workloads/lightspeed-rhel8", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "redhat-user-workloads/lightspeed-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "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-mlflow-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-trustyai-nemo-guardrails-server-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-03-31T02:01:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34070\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34070\nhttps://github.com/langchain-ai/langchain/commit/27add913474e01e33bededf4096151130ba0d47c\nhttps://github.com/langchain-ai/langchain/releases/tag/langchain-core==1.2.22\nhttps://github.com/langchain-ai/langchain/security/advisories/GHSA-qh6h-p6c9-ff54"], "statement": "This flaw is exploitable in applications that accept prompt configs from untrusted sources, including low-code AI builders and API wrappers that expose `load_prompt_from_config()`.\nAlso, the affected functions (`load_prompt`, `load_prompt_from_config`, and the `.save()` method on prompt classes) are undocumented legacy APIs. They are superseded by the `dumpd`/`dumps`/`load`/`loads` serialization APIs in `langchain_core.load`, which do not perform filesystem reads and use an allowlist-based security model.\nAn attacker who controls or influences the prompt configuration dictionary can read files outside the intended directory, such as cloud-mounted secrets, internal system prompts, cloud credentials, Kubernetes manifests, CI/CD configs, application settings.\nDue 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": "[0,1.2.22)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "langchain", "source": "cna", "vendor": "langchain-ai"}, "product": "langchain", "vendor": "langchain-ai"}], "created": "2026-03-31T19:56:22.209276+00:00", "updated": "2026-06-18T09:45:15.864097+00:00", "vendors": ["langchain-ai", "langchain-ai$PRODUCT$langchain"]}