Vulnerability · Published Feb 21, 2026 · Assigned by fedora

CVE-2026-26047Moodle: moodle: uncontrolled resource consumption in tex formula editor leading to denial of service

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in moodle. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 56.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A denial-of-service vulnerability was identified in Moodle’s TeX formula editor. When rendering TeX content using mimetex, insufficient execution time limits could allow specially crafted formulas to consume excessive server resources. An authenticated user could abuse this behavior to degrade performance or cause service interruption.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	moodle/moodle	5.1.2	GHSA-cg8j-5cr2-568q
Packagist	moodle/moodle	5.0.5	GHSA-cg8j-5cr2-568q
Packagist	moodle/moodle	4.5.9	GHSA-cg8j-5cr2-568q

Affected products (as reported)

Vendor	Product	Versions
	moodle	0 – before 4.5.95.0.0 – before 5.0.55.1.0 – before 5.1.2

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

https://access.redhat.com/security/cve/CVE-2026-26047 vdb-entry, x_refsource_REDHAT
RHBZ#2440905 issue-tracking, x_refsource_REDHAT