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HIGH severity

CVE-2021-26543 — git-parse

HIGH

CVE-2021-26543 is a high-severity (CVSS 8.8) OS Command Injection vulnerability in git-parse. 1 public exploit reference exists, so weaponization risk is real. A fix is available for git-parse — see the affected versions and patch details below.

Command injection in git-parse

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Sep 26, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-26543 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

20other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
git-parsenpm
177Kdownloads / week

Description

The "gitDiff" function in Wayfair git-parse <=1.0.4 has a command injection vulnerability. Clients of the git-parse library are unlikely to be aware of this, so they might unwittingly write code that contains a vulnerability. The issue has been resolved in version 1.0.5.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmgit-parseall versions1.0.5npm install git-parse@1.0.5

Affected Products

1 product · 1 configurations
Application
git-parsewayfair
< 1.0.5
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

The "gitDiff" function in Wayfair git-parse <=1.0.4 has a command inject…

advisory.checkmarx.netNVDAug 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for git-parse, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update git-parse to 1.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-26543 is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

The "gitDiff" function in Wayfair git-parse <=1.0.4 has a command injection vulnerability. Clients of the git-parse library are unlikely to be aware of this, so they might unwittingly write code that contains a vulnerability.
O3 Security · Impact-Aware SCA

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CVE-2021-26543: git-parse — Fixed in 1.0.5