Vulnerability in @anthropic-ai/claude-code (CVE-2026-86063)
Summary
Vulnerability in @anthropic-ai/claude-code (CVE-2026-86063). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 2.1.179 or later.
Original description
The description as published by the source.
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 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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-86063 has been found in @anthropic-ai/claude-code.
Risk of unauthorized operations or information disclosure.
What to do: upgrade @anthropic-ai/claude-code to 2.1.179 or later.
If unsure, ask your IT team or search "@anthropic-ai/claude-code CVE-2026-86063" on the vendor's site.
CVE-2026-86063 (@anthropic-ai/claude-code) — CWE-494
Patched: 2.1.179 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-494) exists in @anthropic-ai/claude-code.
Check the vendor advisory for the affected versions of @anthropic-ai/claude-code.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 2.1.179.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@anthropic-ai/claude-code' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r '@anthropic-ai/claude-code' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
@anthropic-ai/claude-codeを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade @anthropic-ai/claude-code to 2.1.179ステージング環境で 2.1.179 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- REDHAT Red Hat
- web github.com
- web github.com
- web github.com