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Mozilla Firefox EUVDEUVD-2026-46240

| CVE-2026-16402 CRITICAL
Integer Overflow or Wraparound (CWE-190)
2026-07-21 mozilla GHSA-8vpq-9f8g-39vm
Buffer Overflow Integer 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
7.5 HIGH

Victim must load attacker content (UI:R) and integer-overflow RCE needs heap grooming/leaks (AC:H); no auth (PR:N) with high memory-corruption impact.

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:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
6.1 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 - 19:07 vuln.today
CVSS changed
Jul 22, 2026 - 18:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:38 cve.org
CRITICAL 9.8

DescriptionCVE.org

Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Memory corruption via integer overflow in Mozilla Firefox's ImageLib graphics component allows remote attackers to potentially achieve code execution by serving a maliciously crafted image, with the flaw resolved in Firefox 153. The CVSS 9.8 rating reflects unauthenticated network reach with high impact to confidentiality, integrity, and availability, though no public exploit has been identified and the EPSS probability of 0.13% (3rd percentile) indicates no observed exploitation activity to date. It is not listed in CISA KEV and there is no public exploit identified at time of analysis.

Technical ContextAI

The vulnerability resides in ImageLib, the image decoding subsystem within Firefox's Graphics stack, which parses and rasterizes untrusted image data (formats such as PNG, JPEG, GIF, WebP, and others) encountered while rendering web content. The root cause is classified as CWE-190 (Integer Overflow or Wraparound): an arithmetic operation - typically a size, dimension, or buffer-length calculation during image decoding - exceeds the range of its integer type and wraps, leading to an undersized allocation or out-of-bounds access. Because image decoding operates automatically on attacker-supplied data with no user action beyond viewing a page, such overflows are a classic path to heap corruption and, potentially, controlled memory writes. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms the Firefox application itself is the affected product across versions prior to the fix.

RemediationAI

Upgrade to Firefox 153 or later, which contains the vendor-released patch (Vendor-released patch: Firefox 153); this is the primary and recommended fix and should be prioritized across desktop deployments. Organizations should also verify that Firefox ESR and Firefox for Android/mobile builds are updated to the corresponding fixed release, consulting the Mozilla advisory at https://www.mozilla.org/security/advisories/mfsa2026-68/ for channel-specific version numbers. Where immediate patching is not possible, compensating controls are limited because image decoding is core browser functionality: enabling or maintaining strict site isolation and sandboxing (default in modern Firefox) contains but does not eliminate the risk, and restricting browsing to trusted sites or routing traffic through a content-inspecting proxy that blocks or transcodes untrusted images can reduce exposure at the cost of usability. Disabling automatic image loading is theoretically possible but breaks most modern web pages and is generally impractical.

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Same weakness CWE-190 – Integer Overflow or Wraparound

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CVE-2013-2729 CRITICAL POC
9.8
CVE-2015-8651 HIGH
8.8
CVE-2012-5054 HIGH POC
8.8
CVE-2014-0569 CRITICAL POC
9.3
CVE-2023-21716 CRITICAL POC
9.8
CVE-2017-3599 HIGH POC
7.5
CVE-2017-7529 HIGH
7.5
CVE-2016-1010 HIGH
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-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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EUVD-2026-46240 vulnerability details – vuln.today
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