CVE-2026-118694

HighCVSS 7.5/10Last modified Oct 29, 2026

Description

python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline link destinations. Attackers can submit repeated '[a](' or '![a](' sequences, causing _find_balanced to rescan the remaining document for each link and consume quadratic CPU time.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-407

Affected software

Vendor	Product	Versions
trentm	python-markdown2	<= 2.5.5

References

Timeline

Published: Oct 28, 2026
Last modified: Oct 29, 2026
NVD status: Deferred

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