CVE-2026-86430

7.5 Élevée

Publiée le 07/09/2026 à 15:20 · Modifiée le 08/10/2026 à 18:17 · Analysée par le NVD · Source : disclosure@vulncheck.com

Description

league/commonmark versions before 2.9.1 contain multiple denial of service vulnerabilities in fenced code block detection, reference link label lookup, and emphasis delimiter processing that perform super-linear work on crafted input. Attackers can submit specially crafted Markdown with long backtick runs, nested brackets, or delimiter sequences to consume disproportionate CPU time and prevent legitimate requests from completing.

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Produits concernés

thephpleague commonmark

Scores CVSS

Version	Score	Source	Vecteur
4.0	8.7 Élevée	disclosure@vulncheck.com	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X`
3.1	7.5 Élevée	disclosure@vulncheck.com	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Faiblesses (CWE)

CWE-407

Références

https://github.com/thephpleague/commonmark/security/advisories/GHSA-j8pm-gj4c-rq4x MitigationPatchVendor Advisory
https://www.vulncheck.com/advisories/league-commonmark-before-2.9.1-denial-of-service-via-parsing Third Party Advisory

CVE-2026-86430

Description

Produits concernés

Scores CVSS

Faiblesses (CWE)

Références

Ailleurs