Cyber Resilience

CVE-2024-1899

MediumPublic PoC

Published: 26 February 2024

Published
26 February 2024
Modified
18 September 2025
KEV Added
—
Patch
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CVSS Score v3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS Score 0.0027 50.5th percentile
Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2024-1899 is a medium-severity Uncontrolled Recursion (CWE-674) vulnerability in Showdownjs Showdown. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application Exhaustion Flood (T1499.003); ranked in the top 49.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-674

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.003 Application Exhaustion Flood Impact
Adversaries may target resource intensive features of applications to cause a denial of service (DoS), denying availability to those applications.
attack.mitre.org →
T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Vulnerability in Showdownjs anchors subparser enables remote DoS via malicious Markdown input causing regex backtracking, exhausting application CPU/resources (T1499.003) or exploiting the application flaw for DoS (T1499.004).

MITRE ATLAS TechniquesAI

MITRE ATLAS techniques

AML.T0048: External Harms

Affected Assets

showdownjs
showdown
≤ 2.1.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CP-7 Alternate Processing Site
addresses: CWE-674

Supports resumption at alternate site when uncontrolled recursion causes primary site failure or crash.

SC-5 Denial-of-service Protection
addresses: CWE-674

Prevents uncontrolled recursion that exhausts stack or CPU resources.

References