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Mozilla Firefox EUVDEUVD-2026-46205

| CVE-2026-16357 CRITICAL
Buffer Overflow (CWE-119)
2026-07-21 mozilla GHSA-gm5x-4m73-f248
Buffer Overflow Red Hat Mozilla
Critical
Disputed · 9.8 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.3 HIGH

Client-side graphics bug needs the victim to load crafted content (UI:R) and reliable memory-corruption exploitation is nontrivial (AC:H); content-process compromise crossing the sandbox boundary justifies S:C with high C/I/A.

3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
7.5 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 17:11 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
CRITICAL 9.8

DescriptionCVE.org

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.

AnalysisAI

Memory corruption in the Graphics component of Mozilla Firefox stems from incorrect boundary conditions (a buffer overflow) that can be triggered when the browser processes maliciously crafted graphics content, potentially leading to arbitrary code execution in the content process. It affects Firefox before 153, Firefox ESR before 115.38, and Firefox ESR before 140.13, and is fixed across those releases per Mozilla advisories MFSA2026-68/69/70. There is no public exploit identified at time of analysis, and the EPSS probability is low (0.15%, 5th percentile) despite the vendor-supplied CVSS of 9.8.

Technical ContextAI

The flaw lives in Firefox's Graphics subsystem, which handles rendering of images, canvas, WebGL/WebRender surfaces and related buffers. CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) indicates the code miscomputes a boundary condition when allocating, indexing, or copying into a memory buffer, allowing reads or writes past the intended bounds. In a browser, such graphics-path overflows are typically reachable by feeding attacker-controlled dimensions or malformed image/graphics data to the rendering pipeline, corrupting heap memory in the sandboxed content process. The single affected CPE is cpe:2.3:a:mozilla:firefox - Mozilla's own Bugzilla entry (bug 2053326) tracks the underlying defect.

RemediationAI

Vendor-released patch: upgrade to Firefox 153 on the standard release channel, or to Firefox ESR 115.38 or ESR 140.13 for organizations on the extended support releases; these builds contain the fix per Mozilla advisories MFSA2026-68/69/70. Because Firefox auto-updates by default, ensure the update mechanism is not disabled and force a restart to apply. If patching must be delayed on managed fleets, reduce exposure by restricting untrusted browsing and, as a partial compensating control, consider disabling hardware acceleration/WebGL via policy to shrink the graphics attack surface - with the trade-off of degraded rendering performance and broken WebGL-dependent sites; this does not fully eliminate the graphics rendering path and should not be treated as equivalent to patching. Advisory URLs: https://www.mozilla.org/security/advisories/mfsa2026-68/, /mfsa2026-69/, /mfsa2026-70/.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2023-4966 HIGH POC
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Same technique Buffer Overflow

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CVE-2019-11043 CRITICAL POC
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CVE-2009-0927 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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EUVD-2026-46205 vulnerability details – vuln.today
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