npm package
ansi-regex 6.0.0 vulnerability, and the version that fixes it
ansi-regex 6.0.0 has 1 known vulnerability (1 rated high or critical); 6.0.1 fixes it.
npm (opens in a new tab) describes it as “Regular expression for matching ANSI escape codes”
- Known vulnerabilities
- 1
- 1 rated high or critical
- Released
- Apr 16, 2021
- Latest is 6.4.0
- Downloads last week
- 9.3K
- Under 1% of ansi-regex downloads
- Licence
- MIT
- Dependencies
- None
- Resolved by deps.dev
What to upgrade to
6.0.1 is the closest release with no known vulnerabilities.
6.0.1Upgrade to this
Fixes the known vulnerability. Released Sep 10, 2021.
No known vulnerabilitiesNewest 6.x release and the latest release. Released Sep 27, 2026.
No known vulnerabilities
Hand the fix to your coding agent
One task with the upgrade, the file to change and why. Paste it into Claude Code, Cursor or Codex.
Findings
- CriticalVulnerability
CVE-2021-3807 in ansi-regex 6.0.0
EPSS: top 11%Inefficient Regular Expression Complexity in chalk/ansi-regex. Fixed in 6.0.1.
- LowOutdated
ansi-regex 6.0.0 is a minor version behind
Latest release is 6.4.0.
- LowOpenSSF Scorecard
chalk/ansi-regex scores 3.8/10 on OpenSSF Scorecard
Weakest checks: No branch protection (Branch-Protection 0/10); Over-privileged CI tokens (Token-Permissions 0/10); Unpinned build dependencies (Pinned-Dependencies 0/10). A low score means weaker upstream security practices, not a known vulnerability.
Every advisory for ansi-regex 6.0.0
Known exploited first (CISA KEV), then by how likely they are to be exploited (FIRST EPSS), then by severity. Each id links to its OSV.dev record.
CriticalCVE-2021-3807 on OSV.dev (opens in a new tab)GHSA-93q8-gq69-wqmwEPSS: top 11%
Inefficient Regular Expression Complexity in chalk/ansi-regex
Fixed in 6.0.1. Published Sep 20, 2021.
Who is still on a vulnerable ansi-regex
2% of last week’s 512.8M ansi-regex downloads went to versions with known vulnerabilities.
From npm’s per-version download counts for the last 7 days, each version checked against OSV.dev. The versions checked cover over 99% of downloads.
Is ansi-regex the only one?
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How this page is checked
StackPrism asks OSV.dev which advisories affect exactly ansi-regex 6.0.0, merges duplicates filed under several ids, and ranks them with CISA’s Known Exploited Vulnerabilities list and FIRST EPSS. Release dates and deprecation come from deps.dev and npm. No AI writes this page: every sentence comes from that data, refreshed every few hours.
Last checked against npm, OSV.dev, deps.dev, CISA KEV and FIRST EPSS.