CVE catalog
CVE-2026-86435
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 dupli
- Severity
- High · CVSS 8.7
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.49% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | php-league-commonmark | sid | 2.10.4-1 | fixed |
| Debian | php-league-commonmark | forky | 2.10.4-1 | fixed |
| Debian | php-league-commonmark | trixie | 2.7.0-1+deb13u1 | vulnerable |
| Debian | php-league-commonmark | bookworm | 2.3.9-1+deb12u1 | vulnerable |
| Ubuntu | php-league-commonmark | pro | 2.3.9-1 | vulnerable |
| Ubuntu | php-league-commonmark | pro | 2.4.1-1 | vulnerable |
| Ubuntu | php-league-commonmark | pro | 2.4.2-1 | vulnerable |
| Ubuntu | php-league-commonmark | pro | 2.4.2-2 | vulnerable |
| Ubuntu | php-league-commonmark | pro | 2.4.2-2ubuntu0.1~esm1 | vulnerable |
| Ubuntu | php-league-commonmark | 26.04 | 2.7.0-1 | vulnerable |
| Ubuntu | php-league-commonmark | 26.04 | 2.7.1-2 | vulnerable |
| Ubuntu | php-league-commonmark | 26.04 | 2.8.0-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | php-league-commonmark | source | sid | 2.9.0-1 | not yet assigned | Not reported | Not reported |
| Debian | php-league-commonmark | source | forky | 2.9.0-1 | not yet assigned | Not reported | Not reported |
| Debian | php-league-commonmark | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | php-league-commonmark | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [php-league-commonmark]Affected
Details (2)
2.3.9-1+deb12u1· all · bookwormAffected
nvd · php-league-commonmark · debian · bookworm; nvd · php-league-commonmark · debian · 12
2.3.9-1+deb12u1· all · bookwormAffected
nvd · php-league-commonmark · debian · bookworm; nvd · php-league-commonmark · debian · 12
[Debian 13 (Trixie)]
- [php-league-commonmark]Affected
Details (2)
2.7.0-1+deb13u1· all · trixieAffected
nvd · php-league-commonmark · debian · 13
2.7.0-1+deb13u1· all · trixieAffected
nvd · php-league-commonmark · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-86435]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-86435]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-86435]
- [https://security-tracker.debian.org/tracker/CVE-2026-86435]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]