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CVE-2026-45570 critical CVSS 9.6

Vulnerability in github.com/go-git/go-git/v5 (CVE-2026-45570)

Summary

Vulnerability in github.com/go-git/go-git/v5 (CVE-2026-45570). Successful exploitation can lead to full system takeover. Exploitable via sq_quote_buf. Mitigation: upgrade to 5.19.1 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 5.19.1 and 6.0.0-alpha.4, go-git's SSH transport constructs the remote exec command by wrapping the repository path in single quotes without escaping single quotes embedded inside the path. A repository path containing a single quote can therefore break out of the quoted region in the exec command and be appended as additional shell tokens. This vulnerability is fixed in 5.19.1 and 6.0.0-alpha.4.

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-2026-45570 has been found in github.com/go-git/go-git/v5.
Attackers can target a specific entry point like sq_quote_buf over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 9.6/10.
What to do: upgrade github.com/go-git/go-git/v5 to 5.19.1 or later.
If unsure, ask your IT team or search "github.com/go-git/go-git/v5 CVE-2026-45570" on the vendor's site.

CVE-2026-45570 (github.com/go-git/go-git/v5) — CWE-116 / CVSS v3 9.6
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: sq_quote_buf / ForceCommand / git
Patched: 5.19.1 — 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.

❓ What is the problem

A vulnerability (CWE-116) exists in github.com/go-git/go-git/v5. Attackers reach the vulnerable code path via sq_quote_buf without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/go-git/go-git/v5. Attack surface: sq_quote_buf / ForceCommand / git.

🔥 Severity

Severity: Critical (CVSS 9.6/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to 5.19.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

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

  1. 1
    Identify 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。

  2. 2
    Apply patch patch 
    Upgrade github.com/go-git/go-git/v5 to 5.19.1

    ステージング環境で 5.19.1 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。

  3. 3
    Post-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

go github.com/go-git/go-git/v5
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.19.1"}]}]
go github.com/go-git/go-git/v6
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.0.0-alpha.4"}]}]
go github.com/go-git/go-git
[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"4.7.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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