CVE-2026-86063

Claude Code: Plugin Hash Pin Bypass Allows Bypass of Hash Pinning

State: Published
Severity: 7.5 High
Published: Oct 13, 2026
Updated: Oct 13, 2026
Reserved: Sep 4, 2026

Description

Claude Code is an agentic coding tool. Prior to 2.1.179, the Claude Code and Claude Desktop plugin installation flow runs git checkout for a marketplace-pinned commit without verifying that the resulting HEAD equals the pinned 40-character SHA. An attacker who controls a plugin repository on a Git host that permits SHA-shaped branch names can create a branch named after the reviewed commit, causing checkout to select the branch tip and install attacker-controlled plugin code. Exploitation requires a user to install the malicious plugin and pin it to the ostensibly safe hash. This issue is fixed in version 2.1.179.

Scores

CVSS	Score	Vector	Source
4.0	7.5 High	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	GitHub_M

Weaknesses

CWE-494 Download of Code Without Integrity Check
CWE-829 Inclusion of Functionality from Untrusted Control Sphere

Affected Products

Product	Versions
claude-codeanthropics	< 2.1.179Affected

References

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