Skip to main content

Mozilla Firefox EUVDEUVD-2026-37089

| CVE-2026-12298 MEDIUM
Out-of-bounds Read (CWE-125)
2026-06-16 mozilla GHSA-pp6j-x3qr-cjgj
Mozilla Information Disclosure Buffer Overflow
Medium
Disputed · 5.4 Vendor: mozilla
Share

Severity by source

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

Network-delivered via browser with no privileges needed; user must visit malicious content (UI:R); impact limited to partial memory disclosure and minor integrity, no availability loss.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
7.5 HIGH
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:R/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 15:52 vuln.today
CVSS changed
Jun 16, 2026 - 15:22 NVD
5.4 (MEDIUM)
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

Out-of-bounds read memory safety bug in Mozilla Firefox allows network-based attackers to cause limited confidentiality and integrity impact by luring users to visit crafted web content. All Firefox versions prior to 152 and Firefox ESR versions prior to 140.12 are affected, per Mozilla security advisories mfsa2026-57 and mfsa2026-58. No public exploit identified at time of analysis, and CISA SSVC assessment confirms no known active exploitation with only partial technical impact.

Technical ContextAI

The vulnerability is classified as CWE-125 (Out-of-bounds Read), a memory safety class defect in which a process reads data past the intended boundary of a buffer. Mozilla's own tagging additionally references buffer overflow behavior, suggesting the underlying memory safety bug may involve adjacent memory regions being misread during browser operations such as content rendering, JavaScript engine processing, or media decoding. The affected product is identified via CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* - all platform variants of Firefox prior to the fixed versions. Firefox ESR (Extended Support Release) is also affected, indicating the vulnerability exists in a shared code path present across both release tracks. The low confidentiality and integrity impact (C:L/I:L) is consistent with an out-of-bounds read that may expose small amounts of adjacent heap or stack memory and potentially allow minor memory state confusion.

RemediationAI

Upgrade Mozilla Firefox to version 152 or later, as confirmed by Mozilla security advisory https://www.mozilla.org/security/advisories/mfsa2026-57/. For organizations using Firefox ESR, upgrade to version 140.12 or later, as confirmed by https://www.mozilla.org/security/advisories/mfsa2026-58/. These are vendor-released patches and represent the definitive fix. If immediate upgrade is not operationally feasible, a compensating control is to restrict user browsing to a curated allowlist of trusted sites using content filtering or DNS policy, which reduces the likelihood of a user visiting attacker-controlled content that could trigger the out-of-bounds read; note this control is imperfect and does not eliminate the vulnerability. Disabling JavaScript in Firefox (via about:config setting javascript.enabled=false) may reduce attack surface for script-triggered memory bugs but will break the majority of modern web functionality and is not recommended for general use.

More in Mozilla

View all
CVE-2015-4495 HIGH POC
8.8 Aug 08

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote
CVE-2013-1690 HIGH POC
8.8 Jun 26

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before

CVE-2013-0758 CRITICAL POC
9.3 Jan 13

Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderb
CVE-2013-0753 CRITICAL POC
9.3 Jan 13

Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox b
CVE-2012-3993 CRITICAL POC
9.3 Oct 10

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbi
CVE-2013-1710 CRITICAL POC
10.0 Aug 07

The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird befo
CVE-2017-3823 HIGH POC
8.8 Feb 01

An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Conta
CVE-2014-8636 HIGH POC
7.5 Jan 14

The XrayWrapper implementation in Mozilla Firefox before 35.0 and SeaMonkey before 2.32 does not properly interact with

CVE-2013-0757 CRITICAL POC
9.3 Jan 13

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbi
CVE-2014-1510 CRITICAL POC
9.8 Mar 19

The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and Se
CVE-2014-1511 CRITICAL POC
9.8 Mar 19

Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remo
CVE-2013-0643 HIGH
8.8 Feb 27

The Firefox sandbox in Adobe Flash Player before 10.3.183.67 and 11.x before 11.6.602.171 on Windows and Mac OS X, and b

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

View all
CVE-2014-0160 HIGH POC
7.5
CVE-2016-5198 HIGH POC
8.8
CVE-2016-1646 HIGH POC
8.8
CVE-2025-5777 HIGH POC
7.5
CVE-2017-5030 HIGH POC
8.8
CVE-2016-4523 HIGH
7.5
CVE-2024-48456 HIGH POC
7.5
CVE-2024-48457 HIGH POC
7.5

Same technique Information Disclosure

View all
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8
CVE-2023-7028 CRITICAL POC
10.0
CVE-2017-0213 HIGH POC
7.3

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

Share

EUVD-2026-37089 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy