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Mozilla Firefox EUVDEUVD-2026-37096

| CVE-2026-12305 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-2x28-ghj8-5fhc
Mozilla Buffer Overflow Red Hat 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:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Remote web content reaches the bug (AV:N, AC:L, PR:N), but a user must load the malicious page so UI:R; impact is a process crash, so only A:H.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/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

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

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

Denial of service in Mozilla Firefox prior to version 152 and Firefox ESR prior to 140.12 stems from a memory safety bug (CWE-119) that remote attackers can trigger via crafted web content. The CVSS 7.5 score reflects high availability impact with no confidentiality or integrity loss, consistent with a browser crash rather than reliable code execution. No public exploit identified at time of analysis, and Mozilla has shipped fixes across multiple advisories (MFSA2026-57, -58, -60, -61).

Technical ContextAI

The flaw is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a class that covers buffer overflows, out-of-bounds reads, and out-of-bounds writes. The affected component is Mozilla Firefox (cpe:2.3:a:mozilla:firefox), the Gecko-based browser whose rendering, JavaScript, and media subsystems are written largely in C++ where memory-safety bugs of this kind regularly surface. Mozilla's own advisory language ("memory safety bug") typically refers to bugs found via fuzzing or internal testing that, with sufficient effort, could be exploited to run arbitrary code - though this specific report only documents the underlying corruption.

RemediationAI

Vendor-released patch: upgrade desktop Firefox to version 152 or later and Firefox ESR to 140.12 or later, per Mozilla advisories MFSA2026-57/58/60/61 at https://www.mozilla.org/security/advisories/. Most enterprise deployments should rely on Firefox's built-in auto-update or push the new MSI/PKG/DEB through their management tooling; ESR consumers running long-term-support channels must specifically pick up 140.12 rather than waiting for the next ESR major. As a compensating control until patching, restrict browsing to trusted sites via web filtering or enforce a stricter content policy (for example, disabling JavaScript on untrusted origins through enterprise policy), accepting that this will break many legitimate sites and is only acceptable as a short-term measure.

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Same weakness CWE-119 – Buffer Overflow

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8.8
CVE-2017-11774 HIGH POC
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CVE-2013-3660 HIGH POC
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Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2015-3113 CRITICAL POC
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CVE-2009-0927 HIGH POC
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CVE-2012-1889 HIGH POC
8.8
CVE-2017-11882 HIGH POC
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CVE-2010-3333 HIGH POC
7.8

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-2026-37096 vulnerability details – vuln.today
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