CVE-2026-86063: Claude Code plugin installation flow hash pin bypass vulnerability

# CVE-2026-86063: Claude Code plugin installation flow hash pin bypass vulnerability

https://gcdradar.vercel.app/incidents/cve-2026-86063-claude-code-plugin-installation-flow-hash-pin · AIR-2026-0317 · closed 2026-10-13

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-10-13
- AI role: Attack on AI
- Products: Claude Code
- CVE ids: CVE-2026-86063
- CVSS: 7.5

## Summary

Claude Code prior to version 2.1.179 runs git checkout for marketplace-pinned commits without verifying the resulting HEAD hash. Attackers can create branch names matching reviewed commits to install unauthorized attacker-controlled plugin code.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-10-15: CVE-2026-86063: Claude Code: Plugin Hash Pin Bypass Allows Bypass of Hash Pinning (https://github.com/advisories/GHSA-pq7j-f95f-qfcv)
- 2026-10-13: CVE-2026-86063: Claude Code is an agentic coding tool. (https://nvd.nist.gov/vuln/detail/CVE-2026-86063)

## Sources

- 2026-10-13 NVD: CVE-2026-86063: Claude Code is an agentic coding tool. https://nvd.nist.gov/vuln/detail/CVE-2026-86063
- 2026-10-15 GitHub Advisory Database: CVE-2026-86063: Claude Code: Plugin Hash Pin Bypass Allows Bypass of Hash Pinning https://github.com/advisories/GHSA-pq7j-f95f-qfcv

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.