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Firefox EUVDEUVD-2026-37091

| CVE-2026-12300 MEDIUM
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-99m4-2rv5-23fh
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
5.3 MEDIUM

Network-accessible browser path requires no authentication or interaction; impact independently assessed as confidentiality-only based on memory read class with no write or crash consequence described.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/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 buffer overflow in Mozilla Firefox (all versions prior to 152) allows remote unauthenticated attackers to read partial process memory contents via network-accessible browser processing paths. The CVSS vector (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) confirms no privileges or user interaction beyond normal browser activity are required, though impact is bounded to low confidentiality disclosure with no integrity or availability consequence. No public exploit has been identified at time of analysis, EPSS stands at 0.27% (18th percentile), and SSVC confirms zero observed exploitation - placing this in the patch-in-normal-cycle category rather than emergency response.

Technical ContextAI

CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) is the root-cause class covering buffer overflows, out-of-bounds reads, and related memory boundary violations. In a browser context, this class typically manifests in media parsers, JavaScript engine subsystems, or network protocol handlers that fail to validate buffer lengths before memory access operations. The affected product is identified via CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, covering all Firefox releases across platforms prior to the fix. Tags indicate Red Hat and SUSE distribution-packaged Firefox builds are also in scope, meaning enterprise Linux deployments carry downstream exposure. The fix was introduced in Firefox 152 and is documented in Mozilla security advisories MFSA2026-57 and MFSA2026-60. The specific internal component triggering the flaw is not disclosed in available sources.

RemediationAI

Upgrade Mozilla Firefox to version 152 or later, which contains the vendor-released patch as confirmed by Mozilla advisories MFSA2026-57 (https://www.mozilla.org/security/advisories/mfsa2026-57/) and MFSA2026-60 (https://www.mozilla.org/security/advisories/mfsa2026-60/). Red Hat and SUSE users should apply distribution-provided Firefox package updates through their standard security channels (e.g., yum/dnf security updates, SUSE patch management) as those builds become available. For enterprise environments managed via browser management platforms or Group Policy, this update should be prioritized in the next scheduled maintenance window given the medium severity and low exploitation activity. Where immediate upgrade is not feasible, filtering untrusted web content at the proxy layer reduces browser exposure to attacker-crafted resources, though this impairs general browsing and is not a substitute for patching.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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CVE-2009-0927 HIGH POC
8.8
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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-2026-37091 vulnerability details – vuln.today
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