Medium
Moodle: moodle: uncontrolled resource consumption in tex formula editor leading to denial of service
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-26047
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 07:39 UTC · Revision 1
Source evidence
Moodle: moodle: uncontrolled resource consumption in tex formula editor leading to denial of service
core-osv · Original sourcePublished 21 Feb 2026, 05:40 UTC
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.
osv:CVE-2026-26047
Complete source record
{
"id": "2a020bd227cb87ea1179385eeb35f88699b54f612f5521cf61312b391b0e0b87",
"url": "https://osv.dev/vulnerability/CVE-2026-26047",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Moodle: moodle: uncontrolled resource consumption in tex formula editor leading to denial of service",
"summary": "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.",
"evidence": "osv:CVE-2026-26047",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-26047",
"aliases": [
"BIT-moodle-2026-26047",
"CVE-2026-26047",
"GHSA-cg8j-5cr2-568q"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/moodle/moodle",
"type": "GIT",
"events": [
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"introduced": "0"
},
{
"fixed": "6b4d33a98f43ac19f1a37952467c8fbc722d0bdb"
},
{
"introduced": "78e860178314c45441a21e0b99455400b8283d48"
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{
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{
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{
"fixed": "ac802ad8043e957fc8d6b9dfba4bb60f20949959"
}
],
"database_specific": {
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{
"cpe": "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*",
"range": [
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"introduced": "0"
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{
"fixed": "4.5.9"
}
],
"source": "CPE_RANGE"
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{
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"range": [
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{
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26047.json"
}
}
],
"modified": "2026-10-28T02:30:26.606777428Z",
"provider": "osv",
"references": [
"https://access.redhat.com/security/cve/CVE-2026-26047",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26047.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-26047",
"https://bugzilla.redhat.com/show_bug.cgi?id=2440905",
"https://github.com/moodle/moodle"
],
"provider_metadata": {
"cwe_ids": [
"CWE-400"
],
"cna_assigner": "fedora",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26047.json"
}
},
"related_cves": [
{
"value": "CVE-2026-26047",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493439,
"published_at": "2026-02-21T05:40:11.001+00:00"
}