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Mozilla Firefox CVE-2026-6746

| EUVDEUVD-2026-24087 HIGH
Use After Free (CWE-416)
2026-04-21 mozilla GHSA-r37m-3hw5-974w
Information Disclosure Memory Corruption Use After Free Mozilla
7.5
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 22, 2026 - 00:45 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 18:23 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
7.5 (HIGH)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24087
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:40 nvd
HIGH 7.5

DescriptionCVE.org

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.

AnalysisAI

High-severity denial-of-service condition in Mozilla Firefox DOM processing allows remote attackers to crash the browser via network-delivered content without authentication or user interaction. Fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10. CVSS 7.5 reflects network attack vector with low complexity (AV:N/AC:L/PR:N/UI:N) but impact limited to availability (A:H). EPSS data not provided. Not listed in CISA KEV, indicating no confirmed active exploitation. SSVC framework rates exploitation as 'none' and technical impact as 'partial', suggesting lower real-world priority despite high CVSS score.

Technical ContextAI

CWE-416 use-after-free vulnerabilities occur when code continues to use a memory pointer after the referenced object has been freed, leading to crashes, memory corruption, or potential code execution. In Firefox's DOM (Document Object Model) Core & HTML component, this flaw affects how the browser parses and processes web page object lifecycles. The CPE identifier cpe:2.3:a:mozilla:firefox confirms impact to Firefox browser across multiple release channels. Use-after-free bugs in DOM processing are particularly concerning because they can be triggered remotely through crafted HTML/JavaScript content delivered via normal web browsing, requiring no special browser configuration or plugins.

RemediationAI

Upgrade to patched versions: Firefox 150 (regular release channel), Firefox ESR 115.35 (older ESR branch), or Firefox ESR 140.10 (current ESR branch) as detailed in Mozilla advisories at https://www.mozilla.org/security/advisories/mfsa2026-30/ through mfsa2026-34/. No workarounds are available for this vulnerability as it exists in core DOM functionality that cannot be disabled without breaking fundamental browser operations. For environments unable to immediately patch, temporary risk reduction requires blocking access to untrusted web content through allow-list-only browsing policies or isolated browsing sessions, though this severely impacts browser utility. Organizations using Firefox ESR should prioritize this update within standard ESR maintenance windows given the low exploitation complexity.

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Same weakness CWE-416 – Use After Free

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CVE-2019-0708 CRITICAL POC
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CVE-2012-4792 HIGH POC
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CVE-2015-0313 CRITICAL POC
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CVE-2015-5122 CRITICAL POC
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CVE-2013-2551 HIGH POC
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Same technique Information Disclosure

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CVE-2014-6324 HIGH POC
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CVE-2023-7028 CRITICAL POC
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CVE-2017-0213 HIGH POC
7.3

Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
openSUSE Leap 16.0 Fixed

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CVE-2026-6746 vulnerability details – vuln.today
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