CVE-2026-86063: CWE-494: Download of Code Without Integrity Check in anthropics claude-code
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.
CVSS v4.0
Score 7.5high
Affected software
anthropics
claude-code
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-04T19:34:03.099Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ace854f2cdf04f6569fefdb
Added to database: 10/13/2026, 19:23:59 UTC
Last updated: 10/13/2026, 20:50:23 UTC
Views: 4
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