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Mozilla Firefox CVE-2026-74964

| EUVDEUVD-2026-60662 CRITICAL
Integer Overflow or Wraparound (CWE-190)
2026-08-18 mozilla GHSA-7p8c-3v22-58jp
Integer Overflow Buffer Overflow Mozilla Red Hat Suse
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
8.8 HIGH

Network-reachable via web content with low complexity and no auth, but the victim must load the malicious page, so UI:R rather than the input's UI:N; impact is high memory corruption within the unchanged content-process scope.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
Aug 19, 2026 - 13:32 vuln.today
CVSS changed
Aug 19, 2026 - 13:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 18, 2026 - 12:23 cve.org
CRITICAL 9.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Integer overflow in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.

AnalysisAI

Memory corruption in Mozilla Firefox's Graphics component stems from an integer overflow (CWE-190) that can be triggered when the browser processes malicious web content, potentially leading to remote code execution within the content process. The flaw affects Firefox before 154 and the ESR 140.x and 153.x branches, and Mozilla has shipped fixes across advisories MFSA2026-74 through MFSA2026-80. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure victim to malicious page
Delivery
Deliver crafted graphics content
Exploit
Trigger integer overflow in Graphics
Execution
Cause out-of-bounds heap write
Impact
Execute code in content process
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to render attacker-controlled web content in an unpatched Firefox (before 154, or ESR before 140.14/153.1) - i.e., visiting a malicious or compromised web page or loading malicious embedded content such as a crafted image, canvas, or WebGL asset that reaches the vulnerable Graphics code path. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, base 9.8) rates this as critical and network-exploitable without privileges or user interaction, but the UI:N metric is questionable for a browser rendering bug: exploitation realistically requires the victim to load attacker-controlled web content, which is user interaction (UI:R) and typically lowers the effective score to ~8.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious web page containing crafted graphics content that triggers the integer overflow when Firefox renders it, and lures a victim to visit the page via phishing or a malicious ad. The overflow leads to an undersized buffer and out-of-bounds write, corrupting heap memory to achieve code execution in the content process. …
Remediation Vendor-released patch: upgrade to Firefox 154, Firefox ESR 140.14, or Firefox ESR 153.1 depending on your release channel, per Mozilla advisories MFSA2026-74/76/77/78/79/80 (https://www.mozilla.org/security/advisories/mfsa2026-74/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Firefox installations and issue an urgent security advisory warning users against visiting untrusted websites; consider temporarily disabling Firefox if operations permit. …

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Same weakness CWE-190 – Integer Overflow or Wraparound

View all
CVE-2013-2729 CRITICAL POC
9.8
CVE-2015-8651 HIGH
8.8
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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
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CVE-2016-1010 HIGH
8.8

Same technique Integer Overflow

View all
CVE-2014-0497 CRITICAL POC
9.8
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

Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/firefox-esr:140.14-75.12 Affected
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
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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CVE-2026-74964 vulnerability details – vuln.today
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