commonmark 1.5.0 before 2.8.4 Denial of Service via Footnote
commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Footnote extension that fails to deduplicate footnote definitions. Attackers can craft documents with duplicate footnote definitions and references to create quadratic output expansion, consuming excessive memory and CPU to exhaust server resources.
CVE-2026-86435
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-2026-86435
commonmark
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": "thephpleague",
"product": "commonmark",
"versions": [
{
"status": "affected",
"version": "1.5.0",
"lessThan": "2.8.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "2.8.4",
"versionType": "semver"
}
],
"packageURL": "pkg:composer/league/commonmark",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-86435
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #12952 · Revision 1
- Added to Heist Feed
- Publisher date