{"id":"GHSA-pq7j-f95f-qfcv","revision":"42c4bbb6f7fa4ab8abe28a92b005c8c5","records":[{"revision":"42c4bbb6f7fa4ab8abe28a92b005c8c5","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-pq7j-f95f-qfcv","aliases":["CVE-2026-86063"],"title":"Claude Code: Plugin Hash Pin Bypass Allows Bypass of Hash Pinning","description":"The plugin install flow in Claude Code and Claude Desktop checked out a marketplace's pinned commit SHA using `git checkout` without verifying that the resulting HEAD matched the pinned SHA. An attacker controlling a plugin's upstream repository could create a branch named identically to the pinned 40-character SHA, causing the checkout to silently resolve to the attacker's branch tip instead of the reviewed commit, resulting in attacker-controlled code being installed bypassing the pinned hash. Exploitation required a user to install a malicious plugin, pin to a safe hash, and for the plugin source to be hosted on a git host that permitted SHA-shaped branch names.\n\nUsers on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version.\n\nThank you to Or Nevo Michrowski of Air Security for reporting this issue.","state":0,"publishedAt":"2026-10-15T20:22:07+00:00","modifiedAt":"2026-10-15T20:30:08.5589079+00:00","affected":[{"ecosystem":"npm","name":"@anthropic-ai/claude-code","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.1.179"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/anthropics/claude-code/security/advisories/GHSA-pq7j-f95f-qfcv","https://nvd.nist.gov/vuln/detail/CVE-2026-86063","https://github.com/anthropics/claude-code","https://github.com/anthropics/claude-code/releases/tag/v2.1.179"],"sourceUrl":"https://github.com/advisories/GHSA-pq7j-f95f-qfcv","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-pq7j-f95f-qfcv","identifiers":["GHSA-pq7j-f95f-qfcv","CVE-2026-86063"]},"retained":false,"historicalAffected":[]}],"coverage":[]}