CVE-2026-26019

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{"affected": [{"affectedData": [{"product": "langchainjs", "vendor": "langchain-ai", "versions": [{"status": "affected", "version": "< 1.1.14"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:langchain:langchain_community:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "44439283-CF4F-44F1-B029-8A83E327DC2C", "versionEndExcluding": "1.1.14", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "LangChain is a framework for building LLM-powered applications. Prior to 1.1.14, the RecursiveUrlLoader class in @langchain/community is a web crawler that recursively follows links from a starting URL. Its preventOutside option (enabled by default) is intended to restrict crawling to the same site as the base URL. The implementation used String.startsWith() to compare URLs, which does not perform semantic URL validation. An attacker who controls content on a crawled page could include links to domains that share a string prefix with the target, causing the crawler to follow links to attacker-controlled or internal infrastructure. Additionally, the crawler performed no validation against private or reserved IP addresses. A crawled page could include links targeting cloud metadata services, localhost, or RFC 1918 addresses, and the crawler would fetch them without restriction. This vulnerability is fixed in 1.1.14."}, {"lang": "es", "value": "LangChain es un framework para construir aplicaciones impulsadas por LLM. Antes de la versi\u00f3n 1.1.14, la clase RecursiveUrlLoader en @langchain/community es un rastreador web que sigue enlaces recursivamente desde una URL inicial. Su opci\u00f3n preventOutside (habilitada por defecto) est\u00e1 destinada a restringir el rastreo al mismo sitio que la URL base. La implementaci\u00f3n utilizaba String.startsWith() para comparar URLs, lo que no realiza una validaci\u00f3n sem\u00e1ntica de URL. Un atacante que controla contenido en una p\u00e1gina rastreada podr\u00eda incluir enlaces a dominios que comparten un prefijo de cadena con el objetivo, haciendo que el rastreador siga enlaces a infraestructura controlada por el atacante o interna. Adem\u00e1s, el rastreador no realizaba ninguna validaci\u00f3n contra direcciones IP privadas o reservadas. Una p\u00e1gina rastreada podr\u00eda incluir enlaces dirigidos a servicios de metadatos en la nube, localhost o direcciones RFC 1918, y el rastreador los obtendr\u00eda sin restricci\u00f3n. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 1.1.14."}], "id": "CVE-2026-26019", "lastModified": "2026-06-17T10:25:36.610", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-26019", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-12T21:14:35.104263Z", "version": "2.0.3"}}]}, "published": "2026-02-11T22:15:51.910", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/langchain-ai/langchainjs/pull/9990"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "@langchain/community: @langchain/community SSRF Bypass in RecursiveUrlLoader", "id": "2439181", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439181"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-918", "details": ["No description is available for this CVE."], "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-2026-26019", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "rhelai3/bootc-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "rhelai3/disk-image-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}], "public_date": "2026-02-11T21:11:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-26019\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-26019\nhttps://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d\nhttps://github.com/langchain-ai/langchainjs/pull/9990\nhttps://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14\nhttps://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.1.14)"}}], "product": "langchainjs", "vendor": "langchain-ai"}], "analysis": {"en": {"generated_at": "2026-04-18T18:09:56.336286+00:00", "value": {"mitigation_remediation": ["Upgrade @langchain/community to version\u202f1.1.14 or later to remove the vulnerability.", "If an upgrade cannot be performed immediately, reconfigure the crawler to allow only explicitly whitelisted domains and reject any URL that resolves to a private or reserved IP address.", "Deploy network\u2011level controls or firewall rules that block outbound HTTP/HTTPS traffic to internal IP ranges, RFC\u202f1918 addresses, localhost, and cloud metadata service endpoints."], "summary": {"action": "Apply patch", "impact": "SSRF Bypass allows attacker to reach internal or cloud metadata resources"}, "threat_synthesis": {"affected_systems": "langchain-ai\u2019s langchainjs library includes the @langchain/community module with the RecursiveUrlLoader class. Versions older than 1.1.14 (1.1.13 and earlier) contain the SSRF bypass. Updated to 1.1.14 eliminates the flaw. The vulnerability affects applications built with Node.js that import @langchain/community and use RecursiveUrlLoader on URLs originating from or reachable through adversary-controlled content.", "description_and_impact": "The flaw resides in the RecursiveUrlLoader class of the @langchain/community component of the langchainjs framework. The loader\u2019s preventOutside option, meant to confine the crawler to the same origin as the start URL, relies on a trivial String.startsWith() check for origin validation. This does not account for URL semantics, and it also fails to reject URLs that resolve to private or reserved IP addresses. An attacker who controls content on a page that the crawler visits can embed links that share a string prefix with the base URL yet point to attacker\u2011controlled domains or to internal infrastructure such as cloud metadata services or localhost. The crawler follows those links, causing a Server Side Request Forgery that can expose confidential data or provide a foothold into the target network. The CVSS score of 4.1 indicates moderate severity.", "risk_and_exploitability": "The vulnerability is a moderate\u2011severity SSRF flaw with a CVSS score of 4.1. The EPSS of less than 1% indicates a very low current likelihood of exploitation, and the vulnerability is not listed in the CISA KEV catalog. The most likely attack path involves an attacker hosting a web page that the application\u2019s crawler processes; by embedding malicious or internal links, the crawler would issue requests to private networks, RFC\u202f1918 addresses, localhost, or cloud metadata endpoints with no restriction. If the application uses the crawler on arbitrary URLs supplied by or reachable from an attacker, the SSRF could be triggered with minimal prerequisites and provide access to internal resources."}}}}, "created": "2026-02-12T09:35:29.248762+00:00", "updated": "2026-04-18T18:15:06.605197+00:00", "vendors": ["langchain-ai", "langchain-ai$PRODUCT$langchainjs"]}