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Mozilla Firefox EUVDEUVD-2026-37081

| CVE-2026-12290 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-g3gr-6w94-3656
Buffer Overflow Mozilla
8.1
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
8.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
vuln.today AI
7.5 HIGH

Network-delivered via web content with no auth but user interaction required; memory corruption realistically affects A as well as C/I, and reliable exploitation of a memory-safety bug is high-complexity.

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:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Jun 18, 2026 - 19:38 vuln.today
CVSS changed
Jun 18, 2026 - 19:38 NVD
8.1 (None) 8.1 (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, Firefox ESR 140.12, and Firefox ESR 115.37.

AnalysisAI

Memory corruption in Mozilla Firefox prior to version 152 allows remote attackers to compromise confidentiality and integrity via a crafted web page that triggers a buffer-related memory safety flaw. The issue also affects Firefox ESR before 140.12 and 115.37 and requires user interaction (e.g., visiting a malicious site). No public exploit identified at time of analysis and EPSS is low (0.16%), but SSVC rates technical impact as total.

Technical ContextAI

The defect is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a buffer overflow-class bug in Firefox's native code. According to the CPE data (cpe:2.3:a:mozilla:firefox), the flaw lives in the Gecko-based browser engine that parses untrusted web content (HTML, JavaScript, media, etc.). Memory safety bugs in browser engines typically arise in C/C++ components handling parsing, rendering, or JIT compilation, and Mozilla's own disclosure language ('memory safety bug') usually implies that, with enough effort, the corruption could be turned into code execution within the content process - though Firefox's sandbox provides additional barriers beyond the content process boundary.

RemediationAI

Vendor-released patch: upgrade to Firefox 152, Firefox ESR 140.12, or Firefox ESR 115.37 as documented in the Mozilla advisories MFSA2026-57 through MFSA2026-61 (https://www.mozilla.org/security/advisories/). Most users will receive the fix automatically through Firefox's built-in updater; enterprise deployments using ESR should validate the 140.12 or 115.37 build through their managed-update channel. As a temporary compensating control until the update is rolled out, restrict browsing to trusted sites, enforce strict content filtering at the web proxy, and consider enabling Firefox's strictest content blocking (Enhanced Tracking Protection set to Strict), accepting that some sites will break; disabling JavaScript site-wide would also reduce the attack surface but is generally impractical for end users.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed

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EUVD-2026-37081 vulnerability details – vuln.today
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