PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-104844 · Microsoft / collected KEV context

EUVD-2026-91741

GHSA-rj75-hqrm-r3gf

cve-program · CVE-2026-104844

• https://github.com/postcss/postcss-selector-parser/security/advisories/GHSA-rj75-hqrm-r3gf
• https://github.com/postcss/postcss-selector-parser/commit/62b191792df0a0bc56062e5a875bc74aae2a51cd
• https://github.com/postcss/postcss-selector-parser/releases/tag/7.1.6

euvd · EUVD-2026-91741

• https://github.com/postcss/postcss-selector-parser/security/advisories/GHSA-rj75-hqrm-r3gf
• https://github.com/postcss/postcss-selector-parser/commit/62b191792df0a0bc56062e5a875bc74aae2a51cd
• https://github.com/postcss/postcss-selector-parser/releases/tag/7.1.6

nvd · CVE-2026-104844

• https://github.com/postcss/postcss-selector-parser/commit/62b191792df0a0bc56062e5a875bc74aae2a51cd
• https://github.com/postcss/postcss-selector-parser/releases/tag/7.1.6
• https://github.com/postcss/postcss-selector-parser/security/advisories/GHSA-rj75-hqrm-r3gf

osv · GHSA-rj75-hqrm-r3gf

• https://github.com/postcss/postcss-selector-parser/security/advisories/GHSA-rj75-hqrm-r3gf
• https://nvd.nist.gov/vuln/detail/CVE-2026-104844
• https://github.com/postcss/postcss-selector-parser/pull/346
• https://github.com/postcss/postcss-selector-parser/commit/62b191792df0a0bc56062e5a875bc74aae2a51cd
• https://github.com/postcss/postcss-selector-parser/commit/70b0779c843462197380d25daa02d1528bf7eae5
• https://github.com/postcss/postcss-selector-parser
• https://github.com/postcss/postcss-selector-parser/releases/tag/6.1.5
• https://github.com/postcss/postcss-selector-parser/releases/tag/7.1.6

• PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion · Source adds a fixed version · 26 Oct 2026