CVE-2026-118694python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations

Beschreibung

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.

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

Referenzen und Patches

• GitHub Issue #750 issue-tracking
• https://github.com/trentm/python-markdown2 product
• https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492 technical-description
• https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029 technical-description
• https://github.com/trentm/python-markdown2/pull/751 patchissue-tracking
• VulnCheck Advisory: python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations third-party-advisory