CVE-2026-6746 (GCVE-0-2026-6746)
Vulnerability from cvelistv5 – Published: 2026-04-21 12:40 – Updated: 2026-07-15 00:41
VLAI
EPSS
VEX
Title
Use-after-free in the DOM: Core & HTML component
Summary
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Severity
7.5 (High)
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 15:08 UTC
Assigner
References
36 references
Impacted products
22 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Mozilla | Firefox |
Unaffected:
115.35 , ≤ 115.*
(rpm)
Unaffected: 140.10 , ≤ 140.* (rpm) Unaffected: 150 , ≤ * (rpm) |
guessed | |
| Mozilla | Thunderbird |
Unaffected:
140.10 , ≤ 140.*
(rpm)
Unaffected: 150 , ≤ * (rpm) |
guessed | |
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:140.10.0-1.el10_1 , < *
(rpm)
Unaffected: 0:140.10.0-1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.1 cpe:/o:redhat:enterprise_linux:10.2 |
||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:140.10.0-1.el10_0 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
||
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support |
Unaffected:
0:140.10.0-2.el7_9 , < *
(rpm)
cpe:/o:redhat:rhel_els:7 |
||
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:140.10.0-1.el8_10 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
0:140.10.0-1.el8_4 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4 |
||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
0:140.10.0-1.el8_4 , < *
(rpm)
cpe:/a:redhat:rhel_eus_long_life:8.4 |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
0:140.10.0-1.el8_6 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6 |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service |
Unaffected:
0:140.10.0-1.el8_6 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.6 |
||
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions |
Unaffected:
0:140.10.0-1.el8_6 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.6 |
||
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
0:140.10.0-1.el8_8 , < *
(rpm)
cpe:/a:redhat:rhel_tus:8.8 |
||
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
0:140.10.0-1.el8_8 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8 |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:140.10.0-1.el9_7 , < *
(rpm)
Unaffected: 0:140.10.0-1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:140.10.0-1.el9_7 , < *
(rpm)
Unaffected: 0:140.10.1-1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 |
||
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions |
Unaffected:
0:140.10.0-1.el9_0 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.0 |
||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:140.10.0-1.el9_2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
||
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
0:140.10.0-1.el9_4 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.4 |
||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:140.10.0-1.el9_6 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
||
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
||
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
||
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
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"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:19348"
}
],
"solutions": [
{
"lang": "en",
"value": "RHSA-2026:19704: Red Hat Enterprise Linux Server (v. 7 ELS)"
},
{
"lang": "en",
"value": "RHSA-2026:17690: Red Hat Enterprise Linux AppStream EUS (v. 10.0)"
},
{
"lang": "en",
"value": "RHSA-2026:19463: Red Hat Enterprise Linux AppStream EUS (v. 10.0)"
},
{
"lang": "en",
"value": "RHSA-2026:10767: Red Hat Enterprise Linux AppStream (v. 10)"
},
{
"lang": "en",
"value": "RHSA-2026:12285: Red Hat Enterprise Linux AppStream (v. 10)"
},
{
"lang": "en",
"value": "RHSA-2026:19041: Red Hat Enterprise Linux AppStream (v. 10)"
},
{
"lang": "en",
"value": "RHSA-2026:19131: Red Hat Enterprise Linux AppStream (v. 10)"
},
{
"lang": "en",
"value": "RHSA-2026:10766: Red Hat Enterprise Linux AppStream (v. 8)"
},
{
"lang": "en",
"value": "RHSA-2026:13537: Red Hat Enterprise Linux AppStream (v. 8)"
},
{
"lang": "en",
"value": "RHSA-2026:19655: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)"
},
{
"lang": "en",
"value": "RHSA-2026:19465: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)"
},
{
"lang": "en",
"value": "RHSA-2026:19542: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6)"
},
{
"lang": "en",
"value": "RHSA-2026:19466: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6)"
},
{
"lang": "en",
"value": "RHSA-2026:17477: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)"
},
{
"lang": "en",
"value": "RHSA-2026:19467: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)"
},
{
"lang": "en",
"value": "RHSA-2026:17687: Red Hat Enterprise Linux AppStream E4S (v.9.0)"
},
{
"lang": "en",
"value": "RHSA-2026:19468: Red Hat Enterprise Linux AppStream E4S (v.9.0)"
},
{
"lang": "en",
"value": "RHSA-2026:17689: Red Hat Enterprise Linux AppStream E4S (v.9.2)"
},
{
"lang": "en",
"value": "RHSA-2026:19461: Red Hat Enterprise Linux AppStream E4S (v.9.2)"
},
{
"lang": "en",
"value": "RHSA-2026:19464: Red Hat Enterprise Linux AppStream EUS (v.9.4)"
},
{
"lang": "en",
"value": "RHSA-2026:19469: Red Hat Enterprise Linux AppStream EUS (v.9.4)"
},
{
"lang": "en",
"value": "RHSA-2026:17688: Red Hat Enterprise Linux AppStream EUS (v.9.6)"
},
{
"lang": "en",
"value": "RHSA-2026:19462: Red Hat Enterprise Linux AppStream EUS (v.9.6)"
},
{
"lang": "en",
"value": "RHSA-2026:10757: Red Hat Enterprise Linux AppStream (v. 9)"
},
{
"lang": "en",
"value": "RHSA-2026:15892: Red Hat Enterprise Linux AppStream (v. 9)"
},
{
"lang": "en",
"value": "RHSA-2026:19201: Red Hat Enterprise Linux AppStream (v. 9)"
},
{
"lang": "en",
"value": "RHSA-2026:19348: Red Hat Enterprise Linux AppStream (v. 9)"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-04-21T14:03:11.980Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-04-21T12:40:44.148Z",
"value": "Made public."
}
],
"title": "firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component",
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-6746",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-22T15:08:29.668813Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-21T17:41:50.489Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThanOrEqual": "115.*",
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},
{
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"version": "140.10",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "150",
"versionType": "rpm"
}
]
},
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"lessThanOrEqual": "140.*",
"status": "unaffected",
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"versionType": "rpm"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "150",
"versionType": "rpm"
}
]
}
],
"credits": [
{
"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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{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
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}
],
"value": "Use-after-free in the DOM: Core \u0026 HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-21T23:34:37.002Z",
"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"shortName": "mozilla"
},
"references": [
{
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2014596"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-30/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-31/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-32/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-33/"
},
{
"url": "https://www.mozilla.org/security/advisories/mfsa2026-34/"
}
],
"title": "Use-after-free in the DOM: Core \u0026 HTML component"
}
},
"cveMetadata": {
"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"assignerShortName": "mozilla",
"cveId": "CVE-2026-6746",
"datePublished": "2026-04-21T12:40:44.148Z",
"dateReserved": "2026-04-21T12:40:43.779Z",
"dateUpdated": "2026-07-15T00:41:08.555Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.