CVE-2026-118694

7.5 HIGHpublic exploit available

Published 2026-10-28 · Updated 2026-10-28

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD 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.

CVSS vector

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

Weaknesses

CWE-407

Public exploit & PoC references

https://github.com/trentm/python-markdown2
https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492
https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029
https://github.com/trentm/python-markdown2/issues/750
https://github.com/trentm/python-markdown2/pull/751

All references

https://github.com/trentm/python-markdown2
https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492
https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029
https://github.com/trentm/python-markdown2/issues/750
https://github.com/trentm/python-markdown2/pull/751
https://www.vulncheck.com/advisories/python-markdown2-through-2.5.5-denial-of-service-via-unclosed-inline-link-destinations

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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