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Mozilla Firefox EUVDEUVD-2026-37092

| CVE-2026-12301 MEDIUM
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-pm44-3cfj-hw45
Buffer Overflow Mozilla
Medium
Disputed · 5.3 Vendor: mozilla
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Severity by source

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

Browser exploitation requires victim to load attacker content (UI:R); C:L only with no integrity or availability impact confirmed.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/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
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:45 vuln.today
CVE Published
Jun 16, 2026 - 11:52 cve.org
MEDIUM 5.3
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.

AnalysisAI

Memory safety bug (CWE-119, buffer overflow class) in Mozilla Firefox prior to version 152 exposes a limited portion of browser memory to remote attackers via network-delivered content. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) reflects a network-exploitable, unauthenticated path with partial confidentiality impact only - no integrity or availability consequences are indicated. No public exploit has been identified at time of analysis, EPSS is low at 0.27% (18th percentile), and CISA SSVC confirms no observed exploitation, placing this in the moderate-priority tier despite its wide network attack surface.

Technical ContextAI

CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) encompasses buffer overflows, out-of-bounds reads, and related memory safety violations. The 'Buffer Overflow' tag confirms this is a memory corruption class defect within Firefox's codebase. CPE string cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* identifies all Firefox versions as potentially affected prior to the fix. Firefox is a large C++ application with substantial attack surface across its HTML/CSS parser, JavaScript engine (SpiderMonkey), media decoders, and IPC mechanisms - all historically common locations for memory safety bugs. The CVSS scope value S:U and impact metrics C:L/I:N/A:N are most consistent with an out-of-bounds read scenario rather than a write primitive, as writes typically enable integrity or availability impact. The Bugzilla reference at https://bugzilla.mozilla.org/show_bug.cgi?id=2015647 may contain the specific component affected, but that detail is not disclosed in the available intelligence.

RemediationAI

Upgrade to Mozilla Firefox 152 or later, which is the vendor-confirmed fix release per the Mozilla security advisories at https://www.mozilla.org/security/advisories/mfsa2026-57/ and https://www.mozilla.org/security/advisories/mfsa2026-60/. SUSE and Red Hat users should apply updated Firefox packages from their respective distribution channels rather than relying solely on Mozilla's direct installer. If immediate patching is blocked, limiting end-user exposure to untrusted external web content via a web filtering proxy or DNS-based blocking of known malicious domains reduces attack surface, though this is not a complete mitigation - it only limits opportunity, not vulnerability. No feature flag or browser configuration disables the underlying memory safety bug, so upgrading to Firefox 152 is the only complete remediation.

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Same weakness CWE-119 – Buffer Overflow

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10.0
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CVE-2023-4966 HIGH POC
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Same technique Buffer Overflow

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CVE-2015-5119 CRITICAL POC
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CVE-2015-3113 CRITICAL POC
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CVE-2020-0796 CRITICAL POC
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CVE-2019-11043 CRITICAL POC
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CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

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

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EUVD-2026-37092 vulnerability details – vuln.today
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