Packagist/league/commonmark CVE-2026-86430: high 7.5, EPSS 0.49%

league/commonmark: Denial of service via crafted code fences, reference links, and emphasis delimiters

Action: Upgrade league/commonmark to 2.9.1 or later.

composer require league/commonmark:2.9.1

Affected

Fixed versions

Sources

• osv: GHSA-j8pm-gj4c-rq4x
• https://github.com/thephpleague/commonmark/security/advisories/GHSA-j8pm-gj4c-rq4x
• https://github.com/thephpleague/commonmark/commit/0768217751fbfaeb8d76762f6944e9af7114295e
• https://github.com/thephpleague/commonmark/commit/d9375fadc308a63a02950a68d822417a6e4c33b2
• https://github.com/thephpleague/commonmark/commit/e0036ef031fd36ec1c3c82db8743fc928b5271c8
• https://github.com/thephpleague/commonmark
• https://github.com/thephpleague/commonmark/releases/tag/2.9.1

CVE-2026-86430 · published 2026-09-01T20:17:59Z · modified 2026-09-08T12:38:32.269578738Z · JSON