CVE-2026-86432CWE-405

CVE-2026-86432

Medium · published September 7, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
35.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00418 · 35.0th percentile
Weakness
CWE-405 · Asymmetric Resource Consumption (Amplification)
Published
2026-09-07T17:20Z
References (2)
https://github.com/thephpleague/commonmark/security/advisories/GHSA-mj63-m3rc-8ppr · [email protected]https://www.vulncheck.com/advisories/commonmark-2.0.0-before-2.8.4-denial-of-service-via-xml · [email protected]
EPSS history
Timeline
  • 09 SEP 03:20Z
    EPSS moved — → 0%
    epss
  • 07 SEP 12:53Z
    commonmark 2.0.0 before 2.8.4 Denial of Service via XML
    cvelistv5