CVE catalog
CVE-2026-111758
node-markdown-it: CVE-2026-111758
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.46% · Oct 25, 2026
markdown-it is a Markdown parser. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched in versions 14.3.3 and 15.0.3.
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 | node-markdown-it | sid | 22.2.3+dfsg+~12.2.3-5 | not affected |
| Debian | node-markdown-it | forky | 22.2.3+dfsg+~12.2.3-5 | not affected |
| Debian | node-markdown-it | trixie | 22.2.3+dfsg+~12.2.3-2 | not affected |
| Debian | node-markdown-it | bookworm | 22.2.3+dfsg+~12.2.3-2 | not affected |
| Ubuntu | node-markdown-it | 22.04 | 10.0.0+dfsg-2 | vulnerable |
| Ubuntu | node-markdown-it | 22.04 | 10.0.0+dfsg-3 | vulnerable |
| Ubuntu | node-markdown-it | 22.04 | 10.0.0+dfsg-3.1 | vulnerable |
| Ubuntu | node-markdown-it | 22.04 | 10.0.0+dfsg-4 | vulnerable |
| Ubuntu | node-markdown-it | 22.04 | 10.0.0+dfsg-5 | vulnerable |
| Ubuntu | node-markdown-it | 22.04 | 10.0.0+dfsg-6 | vulnerable |
| Ubuntu | node-markdown-it | 24.04 | 22.2.3+dfsg+~12.2.3-2 | vulnerable |
| Ubuntu | node-markdown-it | 26.10 | 22.2.3+dfsg+~12.2.3-4 | vulnerable |
| Ubuntu | node-markdown-it | 26.10 | 22.2.3+dfsg+~12.2.3-5 | vulnerable |
| Ubuntu | node-markdown-it | 26.04 | 22.2.3+dfsg+~12.2.3-2 | vulnerable |
| Ubuntu | node-markdown-it | 26.04 | 22.2.3+dfsg+~12.2.3-4 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | node-markdown-it | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | node-markdown-it | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | node-markdown-it | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | node-markdown-it | source | bookworm | Not affected | unimportant | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [node-markdown-it]Not affected
Details (2)
22.2.3+dfsg+~12.2.3-2· all · bookwormNot affected
dsa · node-markdown-it · debian · bookworm
22.2.3+dfsg+~12.2.3-2· all · bookwormNot affected
dsa · node-markdown-it · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-111758]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-111758]
- [https://security-tracker.debian.org/tracker/CVE-2026-111758]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-111758.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]