Is postcss 8.5 vulnerable?

npm · 33 releases from 8.5.0 to 8.5.32 · latest postcss is 8.5.32 · checked 1 Nov 2026

No known advisories in the last release

postcss 8.5.32, the last 8.5 release, has no known advisories. 4 advisories affect earlier 8.5.x releases, so update to 8.5.32.

Update within 8.5:npm install postcss@8.5.32

Is your project affected?

Private repo? Upload its lockfile instead, or connect GitHub to check every repo.

Fixed within 8.5.x, affecting earlier releases

  • MediumCVE-2026-69153GHSA-fxqj-rqcc-2cmp3 Aug 2026

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

    Affected
    <8.5.23
    Fixed in
    8.5.23
  • HighCVE-2026-73646GHSA-r28c-9q8g-f84924 Jul 2026

    PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure

    Affected
    <8.5.18
    Fixed in
    8.5.18
  • HighCVE-2026-45623GHSA-6g55-p6wh-862q23 Jul 2026

    PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

    Affected
    <8.5.12
    Fixed in
    8.5.12
  • MediumCVE-2026-41305GHSA-qx2v-qp2m-jg9324 Apr 2026

    PostCSS has XSS via Unescaped </style> in its CSS Stringify Output

    Affected
    <8.5.10
    Fixed in
    8.5.10

Which of your client projects are still on postcss 8.5?

NPMscan reads the lockfiles in every GitHub repo you pick, finds the exact postcss version each one installs, and checks it against these advisories. Each finding comes with the command that fixes it.

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Other postcss versions

Advisory data from OSV.dev (opens OSV.dev in a new tab), which includes the GitHub Advisory Database. Release list from the npm registry. Refreshed daily.