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  4. CVE 2026 120492 chainlit 2120 ssrf via semicolon path segment in
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-120492

Chainlit 2.12.0 SSRF via Semicolon Path Segment in MCP allowed_urlsCVE-2026-120492

Answer in brief

CVE-2026-120492 records a Medium severity (CVSS 6.3) vulnerability in Chainlit 2.12.0 SSRF via Semicolon Path Segment in MCP allowed_urls. The current sources do not mark it as known exploited. The current feed maps Chainlit/Chainlit (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 2, 2026Updated Nov 2, 2026Source checked Nov 2, 2026First seen by HOL Nov 2, 2026Material review Nov 2, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Chainlit/Chainlit (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Chainlit/Chainlitgeneric2.12.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Chainlit/Chainlit.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 2, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Chainlit 2.12.0 contains a server-side request forgery vulnerability that allows unauthenticated attackers to bypass path-scoped MCP allowed_urls entries because validate_mcp_url does not reject the semicolon character. Attackers can submit MCP URLs with '..;' segments to the /mcp endpoint, causing requests to paths outside the operator's grant on origins that strip semicolon path parameters.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Rancher meta proxy allowlist bypass leading to server-side request forgeryAlso CWE-918

Record context

Vulnerability class
SSRF
EPSS
Not reported
CWE IDs
CWE-918
Source
CVE List V5
Source checked
Nov 2, 2026
References
4 linked sources
Open source record