CVE-2026-86063Public exploitNetwork attack vectorHinoki check available

Code installation via SHA-shaped branch name

Published Oct 13, 2026 · Updated Oct 13, 2026

Hash-pin bypass in Anthropic Claude Code before 2.1.179 allows remote attackers to install unreviewed code through marketplace plugins. The plugin installer runs git checkout without checking that HEAD matches the pinned SHA, allowing a default branch named after that SHA to replace the reviewed commit. Exploitation requires repository control, a Git host permitting SHA-shaped branch names, and a user-installed plugin pinned to the ostensibly safe hash.

CVSS severity7.7
High
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Hash-pin bypass in Anthropic Claude Code before 2.1.179 allows remote attackers to install unreviewed code through marketplace plugins. The plugin installer runs git checkout without checking that HEAD matches the pinned SHA, allowing a default branch named after that SHA to replace the reviewed commit. Exploitation requires repository control, a Git host permitting SHA-shaped branch names, and a user-installed plugin pinned to the ostensibly safe hash.

The record

CVE
CVE-2026-86063
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Anthropic
Product
Claude Code
Classifications
CWE-494, CWE-829, T1195.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.1.179

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Anthropic · Claude Codeversion=< 2.1.179

Published CVSS scores

7.7AnthropicCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
CWE-829Inclusion of Functionality from Untrusted Control Sphere
T1195.002Compromise Software Supply Chain

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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