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Mozilla Firefox EUVDEUVD-2026-37105

| CVE-2026-12314 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-hmg6-wppr-3h56
Buffer Overflow Red Hat Mozilla Suse
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
7.5 HIGH

Browser memory corruption realistically requires the user to load attacker content (UI:R) and reliable exploitation of buffer bugs has nontrivial complexity (AC:H); successful exploitation of a memory safety flaw typically threatens C/I/A together, not C alone.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 19:24 vuln.today
CVSS changed
Jun 16, 2026 - 19:22 NVD
7.5 (HIGH)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.

AnalysisAI

Memory corruption in Mozilla Firefox prior to version 152 and Firefox ESR prior to 140.12 allows remote attackers to compromise browser memory integrity through crafted web content, with confidentiality impact rated High per the CVSS vector. The flaw stems from a buffer-handling defect (CWE-119) reported by Mozilla itself and addressed across multiple security advisories (MFSA2026-57, -58, -60, -61). No public exploit identified at time of analysis, and the issue is not listed in CISA KEV.

Technical ContextAI

The vulnerability is a memory safety bug in Mozilla Firefox, a Gecko-based web browser, classified under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). The 'Buffer Overflow' tag and CWE-119 indicate the defect involves reading or writing outside an allocated buffer, a class of bug Mozilla routinely identifies through its internal fuzzing and code-review programs. The affected CPE 'cpe:2.3:a:mozilla:firefox:*' covers all Firefox versions prior to the fixed releases, and the parallel ESR advisory points to shared code paths between mainline and ESR branches. Mozilla historically batches several memory safety findings under a single CVE when they share root cause patterns, and the cross-referenced advisories (MFSA2026-57/58/60/61) suggest this issue spans both the rapid-release and extended-support trains.

RemediationAI

Upgrade to Vendor-released patch: Firefox 152 for the rapid-release channel or Firefox ESR 140.12 for the extended-support channel, both shipped by Mozilla per advisories MFSA2026-57, MFSA2026-58, MFSA2026-60, and MFSA2026-61. There are no documented configuration workarounds for memory safety defects of this class; if patching is delayed, restrict browser exposure to untrusted web content by enforcing strict tracking protection, disabling JavaScript on untrusted origins via NoScript or enterprise policy (note: breaks most modern sites), and deploying network-level filtering of high-risk content categories. Enterprise administrators using the Firefox MSI/PKG distributions should pin the ESR 140.12 build through the policies.json mechanism to prevent regression to vulnerable versions.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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CVE-2019-11043 CRITICAL POC
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CVE-2009-0927 HIGH POC
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CVE-2012-1889 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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EUVD-2026-37105 vulnerability details – vuln.today
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