What is CVE-2024-1899?

CVE-2024-1899 is a medium-severity vulnerability in Showdownjs Showdown, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2024-02-26.

How severe is CVE-2024-1899?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Showdownjs Showdown

CVE-2024-1899

An issue in the anchors subparser of Showdownjs versions <= 2.1.0 could allow a remote attacker to cause denial of service conditions.

Published 2024-02-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.008 (55.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Showdownjs Showdown — versions 0

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

www.tenable.com/security/research/tra-2024-05 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2024-1899?: CVE-2024-1899 is a medium-severity vulnerability in Showdownjs Showdown, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2024-02-26.
How severe is CVE-2024-1899?: Medium severity. CVSS v3 base score is 5.3 out of 10.