Vulnerability in @anthropic-ai/claude-code (CVE-2026-40068)
Summary
Vulnerability in @anthropic-ai/claude-code (CVE-2026-40068). Successful exploitation can lead to full system takeover. Exploitable via commondir. Mitigation: upgrade to 2.1.84 or later.
Original description
The description as published by the source.
In versions 2.1.63 through 2.1.83 of Claude Code, the folder trust determination logic used the git worktree commondir file without validating its contents. An attacker could craft a malicious repository with a commondir file pointing to a path the victim had previously trusted, causing Claude Code to bypass its trust confirmation dialog and immediately execute hooks defined in .claude/settings.json. Exploitation requires the victim to clone the malicious repository and run Claude Code within it, and the attacker must know or guess a path the victim had already trusted. This issue has been fixed in version 2.1.84.
Source: GitHub Security Advisories (Global) 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-2026-40068 has been found in @anthropic-ai/claude-code.
Attackers can target a specific entry point like commondir over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: upgrade @anthropic-ai/claude-code to 2.1.84 or later.
If unsure, ask your IT team or search "@anthropic-ai/claude-code CVE-2026-40068" on the vendor's site.
CVE-2026-40068 (@anthropic-ai/claude-code) — CWE-20 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: commondir
Patched: 2.1.84 — 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-20) exists in @anthropic-ai/claude-code. Attackers reach the vulnerable code path via commondir without authentication.
Check the vendor advisory for the affected versions of @anthropic-ai/claude-code. Attack surface: commondir.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to 2.1.84.
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
-
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 2.1.84ステージング環境で 2.1.84 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 github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com