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VULNERABILITIES

CVE-2026-118694 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/trentm/python-markdown2 [email protected]Vendor
https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492 [email protected]Source CodeVendor
https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029 [email protected]Source CodeVendor
https://github.com/trentm/python-markdown2/issues/750 [email protected]ExploitIssue TrackingTechnical DescriptionVendor
https://github.com/trentm/python-markdown2/pull/751 [email protected]Issue TrackingVendor

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-407Inefficient Algorithmic Complexity[email protected]

Affected Products

ProductVersions
python-markdown2
<= 2.5.5 (semver)

CPE

  • cpe:2.3:a:python-markdown2_project:python-markdown2:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-118694
NVD Published Date:
Oct 28, 2026
NVD Last Modified:
Oct 29, 2026
Source:
[email protected]
CVE-2026-118694 Details - Not Deferred