Detections
Analytics

Anthropic Claude Code < 2.1.179 Plugin Hash Pinning Bypass (CVE-2026-86063)

high Nessus Plugin ID 370432

Synopsis

An application installed on the remote host is affected by a code integrity check bypass vulnerability.

Description

The version of Anthropic Claude Code installed on the remote host is prior to 2.1.179. It is, therefore, affected by a hash pinning bypass vulnerability:

 - The plugin install flow in Claude Code 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 and bypassing the pinned hash.
 Exploitation required a user to install a malicious plugin, pin it to a safe hash, and for the plugin source to be hosted on a git host that permitted SHA-shaped branch names. (CVE-2026-86063)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade Anthropic Claude Code to version 2.1.179 or later.

See Also

https://github.com/anthropics/claude-code/releases/tag/v2.1.179

http://www.nessus.org/u?cbb9a270

Plugin Details

Severity: High

ID: 370432

File Name: anthropic_claude_code_CVE-2026-86063.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 10/22/2026

Updated: 10/22/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.41

CVSS v2

Risk Factor: High

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-86063

CVSS v3

Risk Factor: High

Base Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v4

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:anthropic:claude_code

Required KB Items: installed_sw/Anthropic Claude Code

Patch Publication Date: 6/16/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-86063