Medium severity · published Feb 21, 2026
CVE-2026-26047
Moodle: moodle: uncontrolled resource consumption in tex formula editor leading to denial of service
6.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
Moodle · Moodle
before 4.5.9; 5.0.0 before 5.0.5; 5.1.0 before 5.1.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26047
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26047
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-26047
Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2440905
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