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Mozilla Firefox CVE-2026-74988

| EUVDEUVD-2026-60699 CRITICAL
Buffer Overflow (CWE-119)
2026-08-18 mozilla GHSA-qmcg-gf85-vjv7
Buffer Overflow Mozilla
9.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Client-side browser bug needs a victim to load malicious content (UI:R) and memory-corruption exploitation is non-trivial (AC:H); code execution yields full C/I/A impact within the content process.

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
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: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 20, 2026 - 18:32 vuln.today
CVSS changed
Aug 20, 2026 - 18:22 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

Internally found bugs present in Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

AnalysisAI

Memory-corruption defects in Mozilla Firefox 153 and Firefox ESR 153.0, disclosed by Mozilla in advisories MFSA2026-74/77/78/80, could allow a remote attacker to corrupt memory and potentially achieve arbitrary code execution within the browser process. The issues were found internally by Mozilla developers and fixed in Firefox 154 and Firefox ESR 153.1. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Lure victim to malicious page
Delivery
Deliver crafted web content
Exploit
Trigger out-of-bounds memory corruption in Gecko
Execution
Execute code in content process
Impact
Attempt sandbox escape / data theft
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to render attacker-controlled web content in a vulnerable Firefox build (version 153 or ESR 153.0) - i.e. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals are mixed and should be read together rather than trusting the headline CVSS 9.8. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts or compromises a web page containing content crafted to trigger one of the memory-corruption bugs, then lures a Firefox 153 / ESR 153.0 user to visit it (via phishing link, malvertising, or a watering-hole site). When the vulnerable Gecko component parses the malicious content, memory is corrupted, potentially leading to code execution in the browser's content process. …
Remediation Vendor-released patch: upgrade to Firefox 154 (standard channel) or Firefox ESR 153.1 (extended support channel); both contain the fixes. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Recommended ActionAI

Within 24 hours, audit Firefox deployment across managed endpoints and identify all systems running versions 153.0 or 153.x. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Same weakness CWE-119 – Buffer Overflow

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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-2026-74988 vulnerability details – vuln.today
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