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Mozilla Firefox EUVDEUVD-2026-33990

| CVE-2026-10702 MEDIUM
Access of Resource Using Incompatible Type (Type Confusion) (CWE-843)
2026-06-02 mozilla GHSA-hmrh-mqv8-rvvr
Information Disclosure Memory Corruption Mozilla
4.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
SUSE
MEDIUM
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:R/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

3
Analysis Generated
Jun 03, 2026 - 16:22 vuln.today
CVSS changed
Jun 03, 2026 - 16:22 NVD
4.3 (MEDIUM)
CVE Published
Jun 02, 2026 - 17:16 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 151.0.3.

AnalysisAI

JIT miscompilation in Firefox's JavaScript engine exposes users to a denial-of-service condition when visiting attacker-controlled web content. The vulnerability stems from a type confusion flaw (CWE-843) in the JIT compiler component, where incorrect type assumptions during optimization can corrupt memory state and crash the browser. No active exploitation has been confirmed (no CISA KEV listing), EPSS stands at 0.02% (5th percentile), and vendor-released patch Firefox 151.0.3 is available per Mozilla advisory mfsa2026-54.

Technical ContextAI

CWE-843 ('Access of Resource Using Incompatible Type', also known as type confusion) arises in JIT compilers when the optimizer incorrectly infers or promotes a variable's type during speculative compilation. In Firefox's SpiderMonkey JavaScript engine, the JIT tier (IonMonkey or similar) may generate machine code that operates on a value as one type when it is actually another, leading to out-of-bounds or misaligned memory accesses. The affected product is Mozilla Firefox across all versions prior to 151.0.3, as identified by CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*. The tags associated with this CVE reference both Information Disclosure and Memory Corruption, which potentially suggest broader impact than the CVSS vector (C:N/I:N/A:L) alone reflects - this discrepancy is worth noting and is flagged in confidence notes.

RemediationAI

Upgrade Mozilla Firefox to version 151.0.3 or later; this is the vendor-confirmed fix per Mozilla advisory mfsa2026-54 (https://www.mozilla.org/security/advisories/mfsa2026-54/). The fix version 151.0.3 is explicitly stated in the CVE description and confirmed by Mozilla. For organizations unable to patch immediately, restricting JavaScript execution via browser policy or deploying a content security proxy to block access to untrusted sites are partial compensating controls - note these carry significant usability trade-offs and do not eliminate risk from compromised or legitimate-but-exploited sites. Managed enterprise deployments should use Mozilla's policy engine (or GPO via Firefox ADMX) to enforce the minimum version requirement across endpoints.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server 16.0 Fixed

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EUVD-2026-33990 vulnerability details – vuln.today
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