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Vulnerabilities

Vulnerability · CVE-2026-86063

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

Published Oct 13, 2026 · catalog updated Oct 15, 2026 · Claude Code: Plugin Hash

Check if you run it

No confirmed exploitation is on record for CVE-2026-86063. EPSS is 0.17%. Act only if a listed version of Claude Code: Plugin Hash is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Claude Code: Plugin Hash).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.17%
Remediation
Version ranges on file
Affected products
npm @anthropic-ai · npm @anthropic-ai/claude-code · vendor anthropics claude-code

The plugin install flow in Claude Code and Claude Desktop checked out a marketplace's pinned commit SHA using 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. Users on standard Claude Code auto-update have received this fix already. Users performing manual updates are advised to update to the latest version. Thank you to Or Nevo Michrowski of Air Security for reporting this issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm @anthropic-aiversion unspecified
  • npm @anthropic-ai/claude-code0 → 2.1.179
  • npm @anthropic-ai/claude-code< 2.1.179
  • vendor anthropics claude-codeversion unspecified

How to fix CVE-2026-86063

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-86063. EPSS is 0.17%. Act only if a listed version of Claude Code: Plugin Hash is installed.

Which versions are affected?

Compare what you have installed with 0 → 2.1.179, < 2.1.179. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-494; CWE-829: Inclusion of Functionality from Untrusted Control Sphere. EPSS 0.17%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2026 · GitHub Advisory Database

    Detected

    The plugin install flow in Claude Code and Claude Desktop checked out a marketplace's pinned commit SHA using 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 com

  2. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @anthropic-ai/claude-code fixed in 2.1.179

  3. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @anthropic-ai/claude-code fixed in 2.1.179

  4. Oct 15, 2026 · GitHub Advisory Database

    Updated

    The plugin install flow in Claude Code and Claude Desktop checked out a marketplace's pinned commit SHA using 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 com

Sources

  • CVE.orgVulnerability recordCVE-2026-86063

    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 r

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-86063

    30-day exploitation probability 0.2%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-pq7j-f95f-qfcv

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

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-86063

    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

    advisories.gitlab.com
  • OpenSSF OSV / OSV ScannerPackage advisoryGHSA-pq7j-f95f-qfcv

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

    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.