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Mozilla Firefox CVE-2026-74977

| EUVDEUVD-2026-60690 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-08-18 mozilla GHSA-v328-g523-3h87
Integer Overflow Buffer Overflow Mozilla
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Low–High)
Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Browser graphics rendering requires the user to load attacker-controlled content, warranting UI:R; availability-only impact is consistent with an integer overflow DoS in a renderer.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
3.4 LOW
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:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Analysis Generated
Aug 18, 2026 - 19:25 vuln.today
CVSS changed
Aug 18, 2026 - 19:22 NVD
7.5 (HIGH)
CVE Published
Aug 18, 2026 - 12:23 cve.org
HIGH 7.5
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 and Firefox ESR 153.1.

AnalysisAI

Integer overflow in Firefox's Graphics component crashes the browser for any user who loads attacker-controlled graphical content, resulting in a denial-of-service condition. All Firefox versions prior to 154 and all Firefox ESR versions prior to 153.1 are affected, covering effectively the entire unpatched Firefox install base globally. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Host malicious graphical payload on attacker-controlled page
Delivery
Victim's Firefox browser loads page or embedded content
Exploit
Graphics component performs integer arithmetic on crafted dimensions
Execution
Overflow wraps value, corrupting internal state
Impact
Browser process crashes, denying service
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Vulnerability AssessmentAI

Exploitation No special server-side configuration is required - Firefox's Graphics component processes graphical content by default in all standard installations. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) classifies this as high severity with a fully remote, unauthenticated, low-complexity attack path. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a webpage containing malicious graphical content - such as a distorted SVG, oversized canvas element, or manipulated WebGL buffer - sized to trigger the integer overflow in Firefox's Graphics component during render. When a victim browses to the page or loads an iframe or advertisement containing the payload, Firefox processes the content and the arithmetic overflow corrupts internal renderer state, causing the browser process to crash and producing a denial of service. …
Remediation Vendor-released patches are available: upgrade to Firefox 154 (standard channel) or Firefox ESR 153.1 (enterprise/extended support channel), as confirmed by Mozilla's official security advisories mfsa2026-74, mfsa2026-77, mfsa2026-78, and mfsa2026-80. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, complete an inventory of Firefox deployments across the organization and map usage to business-critical functions; implement network-level content filtering to restrict access to untrusted external websites, and communicate the vulnerability to affected users with interim usage restrictions. …

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Same weakness CWE-190 – Integer Overflow or Wraparound

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9.8
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Same technique Integer Overflow

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CVE-2014-0497 CRITICAL POC
9.8
CVE-2013-2729 CRITICAL POC
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CVE-2015-8651 HIGH
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CVE-2012-5054 HIGH POC
8.8
CVE-2014-0569 CRITICAL POC
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CVE-2023-21716 CRITICAL POC
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CVE-2017-3599 HIGH POC
7.5
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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-2026-74977 vulnerability details – vuln.today
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