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Mozilla Firefox CVE-2026-8973

| EUVDEUVD-2026-30923 HIGH
Buffer Overflow (CWE-119)
2026-05-19 mozilla GHSA-f4hm-8h94-gvp6
Mozilla Buffer Overflow RCE
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
HIGH
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: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
May 20, 2026 - 17:27 vuln.today
Severity Changed
May 20, 2026 - 17:22 NVD
CRITICAL HIGH
CVSS changed
May 20, 2026 - 17:22 NVD
9.8 (CRITICAL) 8.8 (HIGH)
CVE Published
May 19, 2026 - 12:30 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

Memory safety bugs present in Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 151.

AnalysisAI

Memory corruption vulnerabilities in Mozilla Firefox 150 could enable remote code execution when a user visits a maliciously crafted web page, with Mozilla acknowledging that some of the bugs showed evidence of memory corruption potentially exploitable for arbitrary code execution. The issue is resolved in Firefox 151 per Mozilla advisory MFSA2026-46/MFSA2026-50. No public exploit identified at time of analysis and EPSS remains low (0.04%), but SSVC rates technical impact as total and automatable.

Technical ContextAI

The vulnerability class is CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), encompassing buffer overflows and related memory safety issues common in C/C++ code such as Firefox's Gecko rendering engine and SpiderMonkey JavaScript engine. The affected CPE is cpe:2.3:a:mozilla:firefox covering Firefox 150. These are aggregate memory safety bugs (a large set of Bugzilla IDs is referenced) typically discovered through fuzzing and internal review, where heap or stack memory boundaries can be violated by attacker-controlled content parsed by the browser.

RemediationAI

Vendor-released patch: upgrade to Firefox 151, per Mozilla advisories MFSA2026-46 (https://www.mozilla.org/security/advisories/mfsa2026-46/) and MFSA2026-50 (https://www.mozilla.org/security/advisories/mfsa2026-50/), which is the primary and recommended remediation. Enterprise deployments should push the update via managed channels (e.g., policies.json, MSI deployment, or MDM) and confirm auto-update is enabled for end-user installs. If immediate patching is not possible, compensating controls include enforcing browser isolation or remote browser solutions for untrusted browsing, blocking outbound web access to uncategorized destinations at the proxy (impacting general user productivity), and disabling JavaScript via about:config or enterprise policy for high-risk users (will break most modern sites - only viable for narrow workflows). Additional context is available via NVD at https://nvd.nist.gov/vuln/detail/CVE-2026-8973 and VulDB at https://vuldb.com/vuln/364648.

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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: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
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 Module for Package Hub 15 SP7 Fixed

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CVE-2026-8973 vulnerability details – vuln.today
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