CVE-2026-86432

php-league-commonmark: commonmark versions from 2.0.0 before 2.8.4 contain a denial of service vulnerability in XmlRenderer that emits depth...

CVE-2026-86432 is fixed in php-league-commonmark on 1 platform by DEBIAN-CVE-2026-86432 (version 2.9.0-1), released September 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

n/a

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0042

36th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
php-league-commonmark · Debian 14	2.9.0-1	DEBIAN-CVE-2026-86432	Sep 8, 2026

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