Path Traversal in github.com/go-git/go-git/v5 (CVE-2026-71557)
Summary
Path traversal in github.com/go-git/go-git/v5 (CVE-2026-71557). Data can be tampered with by attackers. Exploitable via dotgit. 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, reference names are not sanitized before being used to construct on-disk paths under the reference storage directory, so a maliciously crafted reference name (for example containing directory-traversal sequences) can cause go-git to write files outside the intended reference storage directory. Versions 5.19.2 and 6.0.0-alpha.5 fix the issue.
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-2026-71557 has been found in github.com/go-git/go-git/v5.
Attackers can target a specific entry point like dotgit over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: 6.3/10.
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-2026-71557" on the vendor's site.
CVE-2026-71557 (github.com/go-git/go-git/v5) — CWE-22 / CVSS v3 6.3
Attack vector: remote (network-reachable)
Attack surface: dotgit
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.
Path traversal (CWE-22) exists in github.com/go-git/go-git/v5. Attackers reach the vulnerable code path via dotgit.
Check the vendor advisory for the affected versions of github.com/go-git/go-git/v5. Attack surface: dotgit.
Severity: Medium (CVSS 6.3/10). 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-2026-71557 golang-github-go-git-go-git
- Ubuntu UBUNTU-CVE-2026-71557 golang-github-go-git-go-git
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- patch github.com
- patch github.com
- patch github.com
- web github.com
- web github.com
- web github.com