StackPrism

npm package

postcss 7.0.5 vulnerabilities, and the version that fixes all of them

postcss 7.0.5 has 7 known vulnerabilities (2 rated high or critical); 8.5.23 fixes all of them.

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

Known vulnerabilities
7
2 rated high or critical
Released
Oct 2, 2018
Latest is 8.5.30
Downloads last week
94.6K
Under 1% of postcss downloads
Licence
MIT
OpenSSF Scorecard
7.5/10
postcss/postcss (opens in a new tab)
Pulls in
8 packages
Resolved by deps.dev

What to upgrade to

8.5.23 is the closest release with no known vulnerabilities.

  • 7.0.39

    Newest 7.x release. Released Oct 4, 2021.

    5 known vulnerabilities, worst rated warning

  • 8.5.23Upgrade to this

    Fixes all 7 known vulnerabilities. Released Jul 24, 2026.

    No known vulnerabilities

  • 8.5.30

    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 7.0.5

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-2021-23368 on OSV.dev (opens in a new tab)GHSA-hwj9-h5mp-3pm3EPSS: top 11%

    Regular Expression Denial of Service in postcss

    Fixed in 7.0.36. Published May 10, 2021.

  2. WarningCVE-2021-23382 on OSV.dev (opens in a new tab)GHSA-566m-qj78-rww5EPSS: top 16%

    Regular Expression Denial of Service in postcss

    Fixed in 7.0.36. Published Jan 7, 2022.

  3. WarningCVE-2023-44270 on OSV.dev (opens in a new tab)GHSA-7fh5-64p2-3v2jEPSS: top 39%

    PostCSS line return parsing error

    Fixed in 8.4.31. Published Sep 30, 2023.

  4. CriticalCVE-2026-45623 on OSV.dev (opens in a new tab)GHSA-6g55-p6wh-862qEPSS: top 53%

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

    Fixed in 8.5.12. Published Jul 23, 2026.

  5. CriticalCVE-2026-73646 on OSV.dev (opens in a new tab)GHSA-r28c-9q8g-f849EPSS: top 57%

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

    Fixed in 8.5.18. Published Jul 24, 2026.

  6. 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.

  7. WarningCVE-2026-41305 on OSV.dev (opens in a new tab)GHSA-qx2v-qp2m-jg93EPSS: top 84%

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

    Fixed in 8.5.10. Published Apr 24, 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 7.0.5, 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.