Description
markdown-it is a Markdown parser. Prior to version 1.3.2, special patterns with length greater than 50 thousand characterss could slow down the parser significantly. Users should upgrade to version 12.3.2 to receive a patch. There are no known workarounds aside from upgrading.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| markdown-it | markdown-it | < 12.3.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-markdown-it | 10.0.0+dfsg-6 | — |
| Debian 13 | node-markdown-it | 10.0.0+dfsg-6 | — |
| Debian 12 | node-markdown-it | 10.0.0+dfsg-6 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | node-markdown-it | No fix yet | — |
| Ubuntu 26.04 LTS | node-markdown-it | No fix yet | — |
| Ubuntu 25.10 | node-markdown-it | No fix yet | — |
| Ubuntu 24.04 LTS | node-markdown-it | No fix yet | — |
| Ubuntu 22.04 LTS | node-markdown-it | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | markdown-it | < 12.3.2 | 12.3.2 | GHSA-6vfc-qv3f-vr6c |