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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
Mozilla Buffer Overflow
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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
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). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker stands up malicious web page
Delivery
Victim navigates to attacker-controlled URL
Exploit
Crafted content triggers buffer-bounds violation in Gecko
Execution
Memory corruption manipulated inside content process
Impact
Sensitive data read or process state altered
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Vulnerability AssessmentAI

Exploitation Exploitation requires a victim using an unpatched Firefox build (before 152) or Firefox ESR (before 140.12 or 115.37) to actively load attacker-controlled web content - the CVSS UI:R reflects this user-interaction requirement, so drive-by exploitation against a passive user is not possible without a visit, click, or navigation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N) reflects a network-reachable, low-complexity, unauthenticated bug requiring user interaction, with high impact on confidentiality and integrity but no availability impact - an unusual pairing for a memory-corruption issue, suggesting the 8.1 score may overstate practical exploitability since real RCE in modern Firefox typically also affects availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious page (or compromises a legitimate site, or buys a malvertising slot) that serves crafted content designed to trip the memory-safety bug; when a victim using a pre-152 Firefox build visits the page, the corrupted buffer state can be leveraged to leak sensitive memory or alter program state inside the content process. No public POC is currently identified, so any successful exploitation would require an attacker to first develop a reliable trigger, likely combined with a sandbox escape to gain meaningful post-browser access.
Remediation 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/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory Firefox deployment across endpoints and identify affected versions (pre-152 standard branch, pre-140.12 and pre-115.37 ESR); notify users to avoid untrusted websites and consider disabling browser plugins temporarily. …

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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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