Resource exhaustion in markdown-it - CVE-2026-48988

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Main Vulnerability Database Vulnerabilities #VU132289

Resource exhaustion in markdown-it - CVE-2026-48988

Published: May 25, 2026


Vulnerability identifier: #VU132289
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-48988
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the smartquotes rule when processing user-supplied markdown with the typographer option enabled. A remote attacker can submit a markdown input containing many consecutive quotation marks to cause a denial of service.

Only applications that render user-supplied markdown with typographer: true are vulnerable.


Affected software

markdown-it
Fedora
nextcloud

How to mitigate CVE-2026-48988

Install security update from vendor's website.

markdown-it - update to 14.2.0
nextcloud - addressed in versions 34.0.4-1.el10_2, 34.0.4-1.el10_4, 34.0.4-1.fc43, 34.0.4-1.fc44, 34.0.4-1.fc45

External References

Related Security Bulletins