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PostCSS: Quadratic complexity in flat selector parsing allows CPU exhaustion

CVE-2026-104844 affects postcss-selector-parser. CVSS base score 5.9 (GitHub Advisory Database). EPSS 0.00394 (percentile 0.31208), scored 2026-10-04. Affected range: < 7.1.6. Fixed version: 7.1.6.

Published 2026-10-05 23:14:26.313399+00:00

CVE

CVE-2026-104844

Product

postcss-selector-parser

CCR priority

23.7 /100 (P4)

CVSS

5.9 /10 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H · GitHub Advisory Database

EPSS

0.00394 · percentile 0.31208 · 2026-10-04

KEV

no

Affected products

• postcss-selector-parser · < 7.1.6 · Fixed version: 7.1.6

Provenance

• GitHub Advisory Database · Source record · observed 2026-10-05 23:10:51.172112+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-104844.html