CVE-2026-2771 (GCVE-0-2026-2771)
Vulnerability from cvelistv5
Published
2026-02-24 13:33
Modified
2026-04-16 14:30
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Undefined behavior in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox |
Unaffected: 115.33 Unaffected: 140.8 Unaffected: 148 |
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|
|||||||||
{
"containers": {
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"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"providerMetadata": {
"dateUpdated": "2026-04-16T14:30:39.225Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"cna": {
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"vendor": "Mozilla",
"versions": [
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"lessThanOrEqual": "115.*",
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"credits": [
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"lang": "en",
"value": "Evyatar Ben Asher, Keane Lucas, Nicholas Carlini, Newton Cheng, Daniel Freeman, Alex Gaynor, and Joel Weinberger using Claude from Anthropic"
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"supportingMedia": [
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"base64": false,
"type": "text/html",
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"value": "Undefined behavior in the DOM: Core \u0026 HTML component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8."
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"providerMetadata": {
"dateUpdated": "2026-04-13T13:52:37.299Z",
"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
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"references": [
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"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2014593"
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{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-13/"
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{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-14/"
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{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-15/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-16/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-17/"
}
],
"title": "Undefined behavior in the DOM: Core \u0026 HTML component"
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"cveMetadata": {
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"datePublished": "2026-02-24T13:33:08.538Z",
"dateReserved": "2026-02-19T15:05:48.804Z",
"dateUpdated": "2026-04-16T14:30:39.225Z",
"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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