php-league-commonmark: commonmark versions from 1.5.0 before 2.10.0 contain a denial of service vulnerability in the AttributesExtension whe...
CVE-2026-86428 is fixed in php-league-commonmark on 1 platform by DEBIAN-CVE-2026-86428 (version 2.10.0-1), released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.
commonmark versions from 1.5.0 before 2.10.0 contain a denial of service vulnerability in the AttributesExtension when processing distinctly-named attributes. Attackers can submit Markdown with numerous distinct attribute names to cause quadratic-time attribute merging and filtering, consuming disproportionate CPU resources and preventing legitimate requests from completing.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| php-league-commonmark · Debian 14 | 2.10.0-1 | DEBIAN-CVE-2026-86428 | Sep 8, 2026 |
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