StackPrism

npm package

postcss 8.5.22 vulnerability, and the version that fixes it

postcss 8.5.22 has 1 known vulnerability; 8.5.23 fixes it.

npm (opens in a new tab) describes it as “Tool for transforming styles with JS plugins”

Known vulnerabilities
1
None rated high or critical
Released
Jul 22, 2026
Latest is 8.5.30
Downloads last week
1.4M
Under 1% of postcss downloads
Licence
MIT
OpenSSF Scorecard
7.5/10
postcss/postcss (opens in a new tab)
Pulls in
3 packages
Resolved by deps.dev

What to upgrade to

8.5.23 is the closest release with no known vulnerabilities.

  • 8.5.23Upgrade to this

    Fixes the known vulnerability. Released Jul 24, 2026.

    No known vulnerabilities

  • 8.5.30

    Newest 8.x release and the latest release. Released Oct 12, 2026.

    No known vulnerabilities

8.5.23 came out on Jul 24, 2026. A coding agent trained before then doesn’t know it exists, so it may suggest an older release. AI knowledge cutoff dates

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

Every advisory for postcss 8.5.22

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.

  1. WarningCVE-2026-69153 on OSV.dev (opens in a new tab)GHSA-fxqj-rqcc-2cmpEPSS: top 63%

    PostCSS: incomplete fix of GHSA-6g55-p6wh-862q — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset

    Fixed in 8.5.23. Published Aug 3, 2026.

Who is still on a vulnerable postcss

46% of last week’s 308.2M postcss 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 postcss the only one?

Paste a public GitHub repo or drop your package.json and see every vulnerable, end-of-life or deprecated dependency, with one fix task. Free, no sign-up.

Check your whole repo

How this page is checked

StackPrism asks OSV.dev which advisories affect exactly postcss 8.5.22, 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.