CVE-2019-25781: Python-Markdown Markdown

Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing

CVSS 8.7 HighEPSS 0.0042 · 36th percentile

Published by the CVE Program (CNA: VulnCheck) at 29 Oct 2026, 13:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Python-Markdown	Markdown pkg:pypi/markdown	affected 3.0 to 3.11.2, inclusive custom Other versions: unaffected

Identifiers

CVE-2019-25781

CNA

VulnCheck

Weakness (CWE)

CWE-407

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.7	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0042, the 36th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

29 Oct 2026, 13:08 UTC Confirmed by the CVE List
29 Oct 2026, 14:17 UTC Confirmed by NVD

Sources

References from the CNA

github.com/Python-Markdown/markdown/issues/798 issue-tracking
github.com/Python-Markdown/markdown product
github.com/Python-Markdown/markdown/issues/1654 issue-tracking
github.com/Python-Markdown/markdown/blob/b41e0aaf1181f1a8cb200cf5a815aad7c0020d23/markdown/inlinepatterns.py#L1155-L1172 technical-description
www.vulncheck.com/advisories/python-markdown-3.0-through-3.11.2-denial-of-service-via-link-bracket-parsing third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.