Skip to main content

Mozilla Firefox CVE-2026-12290

| EUVDEUVD-2026-37081 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-g3gr-6w94-3656
Mozilla Buffer Overflow
8.1
CVSS 3.1 · Vendor: mozilla
Share

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). …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

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
Sign in to reveal

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.
Sign in to read full assessment

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. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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-119 – Buffer Overflow

View all
CVE-2017-11882 HIGH POC
7.8
CVE-2014-6332 HIGH POC
8.8
CVE-2023-4966 CRITICAL POC
9.4
CVE-2015-2426 HIGH POC
8.8
CVE-2013-3918 HIGH POC
8.8
CVE-2017-11774 HIGH POC
7.8
CVE-2013-3660 HIGH POC
7.8
CVE-2017-6736 HIGH POC
8.8

Same technique Buffer Overflow

View all
CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2017-11882 HIGH POC
7.8
CVE-2010-3333 HIGH POC
7.8

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

Share

CVE-2026-12290 vulnerability details – vuln.today
Back

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