Command Injection in simple-git (CVE-2026-102827)
Summary
Command injection in simple-git (CVE-2026-102827). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 4.0.0 or later.
Original description
The description as published by the source.
simple-git's blockUnsafeOperationsPlugin blocks dangerous git options (--upload-pack/--receive-pack/--exec/...) unless the consumer opts in via unsafe:{allowUnsafePack:true}. Detection (@simple-git/argv-parser detectVulnerableFlags) matches the parsed flag NAME against literal-spelling patterns: /--(upload|receive)-pack/ (requires the literal '-pack') and the string '--exec'. But git accepts unambiguous prefix abbreviations of long options, and expandToken (token-expander.ts) returns the LITERAL token as flag.name (it uses the spec only for needsNext, never to canonicalize). So git push --receive-p= parses with flag.name='--receive-p', which /--(upload|receive)-pack/ does NOT match, yet git expands --receive-p -> --receive-pack and runs (on a local/file remote, locally). The clone side is robust (its '--u' substring rule catches every --upload* abbreviation); the push --receive-* and --exe* abbreviations have no equivalent rule and slip through.
Proof of concept (latest: simple-git 3.36.0, @simple-git/argv-parser 1.1.1, default unsafe plugin ON):
Gate vulnerabilityCheck: 'push --receive-pack=touch...' -> BLOCKED; 'push --receive-pa=touch...' and 'push --receive-p=touch...' -> BYPASS (empty vulns); '--exec=' BLOCKED, '--exe=' BYPASS.
End-to-end via simpleGit().push():
CONTROL git.push(['../bare','HEAD:refs/heads/c','--receive-pack=touch /tmp/pwned_ctrl;']) -> throws GitPluginError 'Use of --upload-pack or --receive-pack is not permitted...'; no command runs.
BYPASS gi…
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-2026-102827 has been found in simple-git.
Successful exploitation can lead to full system takeover. CVSS score: 8.1/10.
What to do: upgrade simple-git to 4.0.0 or later.
If unsure, ask your IT team or search "simple-git CVE-2026-102827" on the vendor's site.
CVE-2026-102827 (simple-git) — CWE-77 / CVSS v3 8.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 4.0.0 — 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-77) exists in simple-git.
Check the vendor advisory for the affected versions of simple-git.
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover.
Update to 4.0.0.
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 'simple-git' . 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 'simple-git' . | 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
simple-git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 simple-git to 4.0.0ステージング環境で 4.0.0 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
- web github.com
- web github.com
- web github.com
- web github.com
- web nvd.nist.gov
- web github.com