Vulnerability in github.com/go-git/go-git/v5 (CVE-2026-71556)
Summary
Vulnerability in github.com/go-git/go-git/v5 (CVE-2026-71556). Data can be tampered with by attackers. Exploitable via worktreeFilesystem. Mitigation: upgrade to 5.19.2 or later.
Original description
The description as published by the source.
go-git is an extensible git implementation library written in pure Go. Prior to 5.19.2 and 6.0.0-alpha.5, worktree operations (including checkout, status, and add) resolve symbolic links inside the working tree without confining resolution to the worktree boundary, so a maliciously crafted repository containing a symlink can cause go-git to read from or write to files outside the intended working directory when the repository is cloned and its worktree operations are used. Versions 5.19.2 and 6.0.0-alpha.5.
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-2026-71556 has been found in github.com/go-git/go-git/v5.
Attackers can target a specific entry point like worktreeFilesystem over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 7.1/10.
What to do: upgrade github.com/go-git/go-git/v5 to 5.19.2 or later.
If unsure, ask your IT team or search "github.com/go-git/go-git/v5 CVE-2026-71556" on the vendor's site.
CVE-2026-71556 (github.com/go-git/go-git/v5) — CWE-59 / CVSS v3 7.1
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: worktreeFilesystem / Worktree
Patched: 5.19.2 — 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-59) exists in github.com/go-git/go-git/v5. Attackers reach the vulnerable code path via worktreeFilesystem without authentication.
Check the vendor advisory for the affected versions of github.com/go-git/go-git/v5. Attack surface: worktreeFilesystem / Worktree.
Severity: High (CVSS 7.1/10). Data can be tampered with by attackers.
Update to 5.19.2.
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 'github.com/go-git/go-git/v5' . 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 'github.com/go-git/go-git/v5' . | 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
github.com/go-git/go-git/v5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 github.com/go-git/go-git/v5 to 5.19.2ステージング環境で 5.19.2 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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-71556 golang-github-go-git-go-git
- Ubuntu UBUNTU-CVE-2026-71556 golang-github-go-git-go-git
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- patch github.com
- web github.com
- web github.com
- web github.com