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Firefox CVE-2026-6784

| EUVDEUVD-2026-24125 HIGH
Out-of-bounds Read (CWE-125)
2026-04-21 mozilla GHSA-fcrv-8vh3-4pg3
Information Disclosure Mozilla Buffer Overflow RCE
7.5
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/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:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

8
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Analysis Updated
Apr 22, 2026 - 00:30 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 16:30 vuln.today
CVSS changed
Apr 21, 2026 - 14:22 NVD
7.5 (HIGH)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24125
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
HIGH 7.5

DescriptionCVE.org

Memory safety bugs present in Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.

AnalysisAI

Memory corruption in Firefox 149 and Thunderbird 149 enables remote code execution when users interact with malicious web content. Mozilla patched 55 distinct memory safety bugs in Firefox 150, some demonstrating memory corruption that could be weaponized for arbitrary code execution. While no public exploit is confirmed, the CVSS score of 7.5 reflects high complexity requiring user interaction, with SSVC assessment indicating total technical impact despite no current automation or active exploitation.

Technical ContextAI

This vulnerability encompasses a class of memory safety bugs (CWE-125: Out-of-bounds Read) affecting Mozilla's Gecko rendering engine used in both Firefox and Thunderbird. The affected CPE (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) indicates Firefox browser versions, with 55 distinct Bugzilla issues referenced spanning bug IDs from 1536243 through 2029801. Memory safety vulnerabilities in browser engines typically involve unsafe memory operations in C/C++ code handling JavaScript execution, DOM manipulation, CSS parsing, or media processing. The consolidated nature of this CVE (covering 55 bugs) suggests these are related memory corruption issues discovered through fuzzing and internal security audits rather than a single root cause, representing Mozilla's quarterly bundling practice for memory safety fixes.

RemediationAI

Upgrade to Firefox 150 or later immediately, as confirmed by Mozilla Security Advisories MFSA2026-30 and MFSA2026-33 (https://www.mozilla.org/security/advisories/mfsa2026-30/). For Thunderbird users, apply the corresponding Thunderbird 150 update referenced in MFSA2026-33. Organizations using Firefox ESR should consult Mozilla's ESR release schedule for the equivalent patched version. If immediate patching is not feasible, implement browser isolation technologies (such as virtual desktop infrastructure or browser isolation services) to contain potential exploitation, though this adds significant infrastructure overhead and user experience friction. Alternatively, temporarily restrict Firefox/Thunderbird usage to trusted internal sites only via proxy URL filtering, but this severely limits functionality. No effective workaround exists that maintains full browser capability while mitigating memory corruption risks, making timely patching the only practical remediation.

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Same weakness CWE-125 – Out-of-bounds Read

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7.5
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CVE-2017-5030 HIGH POC
8.8
CVE-2016-4523 HIGH
7.5
CVE-2024-48456 HIGH POC
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CVE-2024-48457 HIGH POC
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Same technique Information Disclosure

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CVE-2013-2251 CRITICAL POC
9.8
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CVE-2025-24813 CRITICAL POC
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CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
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10.0
CVE-2017-0213 HIGH POC
7.3

Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-6784 vulnerability details – vuln.today
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