CVE-2026-86432

EUVD-2026-72390
commonmark versions from 2.0.0 before 2.8.4 contain a denial of service vulnerability in XmlRenderer that emits depth-proportional indentation for every XML tag. Attackers can provide deeply nested Markdown or AST structures to cause quadratic memory consumption and output amplification, exhausting server resources.
Amplification
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 15.89%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
thephpleaguecommonmark
2.0.0 ≤
𝑥
< 2.8.4
CNA
Debian logo
Debian Releases
Debian Product
Codename
php-league-commonmark
bookworm
vulnerable
forky
2.10.0-1
fixed
sid
2.10.0-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://github.com/thephpleague/commonmark/security/advisories/GHSA-mj63-m3rc-8ppr
https://www.vulncheck.com/advisories/commonmark-2.0.0-before-2.8.4-denial-of-service-via-xml