Server-side request forgery in Trawl MCP policy via IPv4-mapped IPv6
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
Trawl from 1.5.0 before 1.10.0 contains a server-side request forgery flaw (CWE-918) in its MCP outbound URL policy. An unauthenticated remote attacker can bypass that policy by using IPv4-mapped IPv6 addresses, either directly or through redirects, to make the server fetch loopback, private, and cloud metadata services and read the responses.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
Trawl 1.5.0 before 1.10.0 contains a server-side request forgery vulnerability that allows unauthenticated attackers to bypass the MCP outbound URL policy using IPv4-mapped IPv6 addresses. Attackers can supply hex-normalized addresses like ::ffff:7f00:1 directly or via redirects to fetch loopback, private, and cloud metadata services and read responses.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
Upgrade germondai trawl to version 1.10.0, which fixes the issue.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA trawl (germondai) Fixed in 1.10.0
Vendor assessments
Timeline
- 2026-11-04 Threatist record created from CVE-2026-122140
- 2026-11-04 Alias added: GHSA-42jx-rr99-g8v2
- 2026-11-06 Priority changed: MEDIUM → LOW
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
Patch 2
Sources
- CVE-2026-122140 · CVE Program
- CVE-2026-122140 · NVD
- FIRST EPSS
- GHSA-42jx-rr99-g8v2 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-122140 · Red Hat security data · CC BY 4.0
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