OS Command Injection in simple-git (CVE-2026-102828)
Summary
OS command injection in simple-git (CVE-2026-102828). Successful exploitation can lead to full system takeover. Exploitable via blockUnsafeOperationsPlugin. Mitigation: upgrade to 4.0.1 or later.
Original description
The description as published by the source.
Affected product
The default blockUnsafeOperationsPlugin in simple-git when an application permits untrusted values to reach SimpleGitOptions.config or Git inline configuration arguments such as -c =.
Summary
trailer..cmd is not recognized as unsafe by the default guard. Therefore, a configured inline value reaches Git without a GitPluginError.
Git documents trailer..cmd as a shell command invoked by git interpret-trailers. An application that relies on the default plugin to reject unsafe configuration can therefore execute a command supplied through an untrusted trailer-command configuration value.
Technical details
simple-git/src/lib/git-factory.ts installs commandConfigPrefixingPlugin before blockUnsafeOperationsPlugin. The prefixing plugin in simple-git/src/lib/plugins/command-config-prefixing-plugin.ts turns every SimpleGitOptions.config entry into -c = before the unsafe-operation plugin evaluates the final argv.
In simple-git@3.36.0, blockUnsafeOperationsPlugin delegates to @simple-git/argv-parser. packages/argv-parser/src/vulnerabilities/detect-vulnerable-config-writes.ts compares parsed configuration writes against preventUnsafeConfig. That list has no matcher for trailer..cmd, so the invocation is allowed.
Git v2.39.5's Documentation/git-interpret-trailers.txt states that trailer..cmd specifies a shell command called to generate or modify a trailer.
Preconditions
The application must use an affected `s…
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-2026-102828 has been found in simple-git.
Attackers can target a specific entry point like blockUnsafeOperationsPlugin over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: upgrade simple-git to 4.0.1 or later.
If unsure, ask your IT team or search "simple-git CVE-2026-102828" on the vendor's site.
CVE-2026-102828 (simple-git) — CWE-78 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: blockUnsafeOperationsPlugin / SimpleGitOptions.config / GitPluginError / commandConfigPrefixingPlugin
Patched: 4.0.1 — 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.
OS command injection (CWE-78) exists in simple-git. Attackers reach the vulnerable code path via blockUnsafeOperationsPlugin without authentication.
Check the vendor advisory for the affected versions of simple-git. Attack surface: blockUnsafeOperationsPlugin / SimpleGitOptions.config / GitPluginError / commandConfigPrefixingPlugin.
Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.
Update to 4.0.1.
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 4.0.1ステージング環境で 4.0.1 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
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com