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Mozilla Firefox CVE-2026-74984

| EUVDEUVD-2026-60696 MEDIUM
Race Condition (CWE-362)
2026-08-18 mozilla GHSA-78q4-c4hp-5cq9
Mozilla Information Disclosure Race Condition
Medium
Disputed · 6.8 Vendor: mozilla
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Severity by source

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

Network delivery via malicious page mandates UI:R; race-condition timing dependency justifies AC:H; no auth needed (PR:N); memory read/write impact maps to C:H/I:H with no availability consequence.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/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:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Aug 20, 2026 - 18:40 vuln.today
CVSS changed
Aug 20, 2026 - 18:22 NVD
6.8 (MEDIUM)
CVE Published
Aug 18, 2026 - 12:23 cve.org
MEDIUM 6.8
CVE Published
Aug 18, 2026 - 12:23 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

AnalysisAI

Race condition in Firefox's JavaScript Engine (CVE-2026-74984) exposes users on all Firefox versions prior to 154 and ESR versions prior to 153.1 to potential confidentiality and integrity compromise. The CWE-362 flaw creates a timing window during concurrent JavaScript execution in which an attacker-controlled script can race against the engine's internal state management, enabling memory read or write access. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts malicious JavaScript page
Delivery
Lure target user to visit page via phishing or ad injection
Exploit
Crafted JS triggers concurrent execution race in JS Engine
Execution
Engine enters unsynchronized memory state
Persist
Attacker script reads or corrupts sensitive memory
Impact
Confidentiality or integrity of browser session compromised
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target to actively visit a malicious or compromised web page using a vulnerable Firefox version (prior to 154, or ESR prior to 153.1). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 6.8 Medium score reflects a genuinely constrained threat profile: AV:N confirms network reachability, but AC:H and UI:R substantially limit exploitation - the attacker must both win a precise race condition timing window and convince the user to visit a malicious page. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a web page containing crafted JavaScript designed to trigger a race condition in Firefox's JavaScript Engine against a vulnerable version (pre-154 / pre-ESR 153.1). The target user is lured to the malicious page - via phishing link or compromised advertisement - and the script races against the engine's concurrent garbage collector or JIT compiler to access memory in a transient inconsistent state. …
Remediation Vendor-released patches are confirmed: upgrade to Firefox 154 or, for enterprise ESR deployments, Firefox ESR 153.1. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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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-2026-74984 vulnerability details – vuln.today
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