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CVE-2026-27795

LangChain is a framework for building LLM-powered applications. Prior to version 1.1.8, a redirect-based Server-Side Request Forgery (SSRF) bypass exists in `RecursiveUrlLoader` in `@langchain/community`. The loader validates the initial URL but allows the underlying fetch to follow redirects automatically, which permits a transition from a safe public URL to an internal or metadata endpoint without revalidation. This is a bypass of the SSRF protections introduced in 1.1.14 (CVE-2026-26019). Use
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e935aec08bd9a7ed178b925c0336bf8f85d30192ff3b6dd31251b39e1042d35f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"langchainjs","vendor":"langchain-ai","versions":[{"status":"affected","version":"< 1.1.18"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"name":"https://github.com/langchain-ai/langchainjs/commit/2812d2b2b9fd9343c4850e2ab906b8cf440975ee","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langchainjs/commit/2812d2b2b9fd9343c4850e2ab906b8cf440975ee"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/references/3
{"name":"https://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/references/4
{"name":"https://github.com/langchain-ai/langchainjs/pull/9990","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langchainjs/pull/9990"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/references/2
{"name":"https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/references/5
{"name":"https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.18","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.18"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/references/6
{"name":"https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7","tags":["x_refsource_MISC"],"url":"https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/references/1
{"name":"https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-mphv-75cg-56wg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-mphv-75cg-56wg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c35e09e018dc1cdc23a32f4e3bcb96bc4516f2b00d3a3d8111fdf19d7c56b5f3 · sha256:ae7c727aeec3b891… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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