Mistune before 3.3.0 Quadratic Denial of Service via parse_link_text
Mistune before 3.3.0 contains an inefficient algorithmic complexity vulnerability in parse_link_text that allows remote attackers to cause denial of service through unbalanced square brackets. Attackers can submit markdown containing long runs of unmatched brackets to mistune.html(), triggering repeated forward scans that stall worker processes for minutes.
CVE-2026-115347
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-115347
mistune
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "lepture",
"product": "mistune",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.3.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "3.3.0",
"versionType": "semver"
}
],
"packageURL": "pkg:pypi/mistune",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-115347
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #52313 · Revision 1
- Added to Heist Feed
- Publisher date