CVE-2024-1899 Showdownjs Denial of Service
A remote attacker can cause a denial of service in the Showdownjs library via the anchors subparser, affecting applications using this npm package.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-1899?
CVE-2024-1899 is a medium-severity denial of service vulnerability in Showdownjs Showdown, published on 26 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.
Weakness: CWE-674
Which versions are affected by CVE-2024-1899?
2 open source packages ship an affected version, including showdown. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
showdown npm | All versions to 2.1.0 | None |
showdown npm | All versions to 2.1.0 | None |
Products include Showdownjs Showdown.
How do I fix CVE-2024-1899?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-1899 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-1899 exists.
Sources
Also known as CLEANSTART-2026-JB83386, GHSA-rmmh-p597-ppvv, MINI-4mm5-73cg-pq28, MINI-4v72-65p8-749h, MINI-6hf8-vh24-7g49, MINI-gv2w-473x-j7xw and 2 more.