CVE-2026-27795

HIGHNVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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). Users should upgrade to @langchain/community 1.1.18, which validates every redirect hop by disabling automatic redirects and re-validating Location targets before following them. In this version, automatic redirects are disabled (redirect: "manual"), each 3xx Location is resolved and validated with validateSafeUrl() before the next request, and a maximum redirect limit prevents infinite loops.

CVSS v3
7.4
EG Score
7.4(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

February 25, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 4, 2026
Patch available. Sources: github, github_commit, github_pr.
github Patch Available

SSRF Bypass in RecursiveUrlLoader via redirect chaining · Advisory · langchain-ai/langchainjs · GitHub

https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-mphv-75cg-56wg
github Patch Available

SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation · Advisory · langchain-ai/langchainjs · GitHub

https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7
github_pr Patch Available

feat(core,community): ssrf hardening

Patch available: langchain-ai/langchainjs @langchain/[email protected] (PR #9990 merged 2026-02-11)

https://github.com/langchain-ai/langchainjs/pull/9990
github_commit Patch Available

commit d5e3db0d01ab (langchain-ai/langchainjs)

Patch available: langchain-ai/langchainjs @langchain/[email protected] (contains commit d5e3db0d01ab)

https://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d
github_commit Patch Available

commit 2812d2b2b9fd (langchain-ai/langchainjs)

Patch available: langchain-ai/langchainjs @langchain/[email protected] (contains commit 2812d2b2b9fd)

https://github.com/langchain-ai/langchainjs/commit/2812d2b2b9fd9343c4850e2ab906b8cf440975ee

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@langchain/community—1.1.18—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 28× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 182 total refreshes for this CVE.

  1. 2026-09-19 14:33 UTCOSV refresh
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 19:27 UTCEPSS rescore
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  10. 2026-08-14 09:00 UTCEG score recompute
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  29. 2026-08-02 19:33 UTCEG score recompute▲ 3.30
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-27795?
CVE-2026-27795 is a high vulnerability published on February 25, 2026. 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…
When was CVE-2026-27795 disclosed?
CVE-2026-27795 was first published in the National Vulnerability Database on February 25, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27795 actively exploited?
CVE-2026-27795 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 89.0% of all scored CVEs.
What is the CVSS score of CVE-2026-27795?
CVE-2026-27795 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-27795?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27795, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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