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Mozilla Firefox CVE-2026-8389

| EUVDEUVD-2026-29464 HIGH
Buffer Overflow (CWE-119)
2026-05-12 mozilla GHSA-qh6r-h4hf-pr8w
Buffer Overflow Mozilla
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jun 08, 2026 - 10:33 vuln.today
CVSS changed
Jun 05, 2026 - 17:22 NVD
7.3 (HIGH) 8.8 (HIGH)
CVSS changed
May 13, 2026 - 16:22 NVD
7.3 (HIGH)
CVE Published
May 12, 2026 - 12:36 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

AnalysisAI

Memory corruption in Mozilla Firefox versions prior to 150.0.3 stems from a JIT (Just-In-Time) compiler miscompilation in the JavaScript engine, allowing remote attackers to trigger high-impact compromise of confidentiality, integrity, and availability when a user visits a malicious web page. The flaw carries a CVSS score of 8.8 and requires user interaction (loading attacker-controlled JavaScript), but no authentication. There is no public exploit identified at time of analysis, though a GitHub repository referenced from NVD suggests early proof-of-concept research, and EPSS scores the exploitation probability at only 0.02% despite the high CVSS severity.

Technical ContextAI

The vulnerability resides in Firefox's SpiderMonkey JavaScript engine, specifically in the JIT (Just-In-Time) compilation subsystem responsible for translating hot JavaScript code paths into optimized native machine code at runtime. A miscompilation occurs when the JIT generates incorrect native code under specific input conditions, producing code that violates the language-level type and bounds invariants the interpreter would have enforced. Per CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), this allows out-of-bounds memory reads or writes from compiled JavaScript, which is the classic root cause class for browser-based remote code execution. The affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, indicating all Firefox versions prior to the 150.0.3 fix line are in scope.

RemediationAI

Upgrade to Vendor-released patch: Firefox 150.0.3 or later, which contains the fix per the CVE description and Mozilla advisory MFSA 2026-45 (https://www.mozilla.org/security/advisories/mfsa2026-45/). Enterprise deployments using Firefox ESR should consult Mozilla for the corresponding ESR release containing the backport. If immediate patching is not possible, a high-friction but effective workaround is to disable the JavaScript JIT via the about:config preferences javascript.options.ion, javascript.options.baselinejit, and javascript.options.native_regexp - this eliminates the vulnerable code path but causes a substantial performance regression in JavaScript-heavy applications and is not recommended for general user populations. Restricting browsing to trusted internal sites via web filtering, or routing users through a remote browser isolation product, are alternative compensating controls; both reduce attack surface at the cost of user experience.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2017-11774 HIGH POC
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CVE-2013-3660 HIGH POC
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CVE-2017-6736 HIGH POC
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Same technique Buffer Overflow

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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
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CVE-2017-11882 HIGH POC
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CVE-2010-3333 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server 16.0 Fixed

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CVE-2026-8389 vulnerability details – vuln.today
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