CVE-2026-86432

Public on 2026-09-07
Modified on 2026-09-08
Description
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.
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
5.3
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2023 python-CommonMark Not Affected
Amazon Linux 2027 Preview python-CommonMark Not Affected
Amazon Linux 2023 python-recommonmark Not Affected
Amazon Linux 2027 Preview python-recommonmark Not Affected

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-86432 Mitre: CVE-2026-86432