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Mozilla Firefox EUVDEUVD-2026-29465

| CVE-2026-8390 HIGH
Use After Free (CWE-416)
2026-05-12 mozilla GHSA-ggqh-jgm2-3w29
Information Disclosure Use After Free Memory Corruption Mozilla
7.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Lifecycle Timeline

3
Analysis Generated
Jun 08, 2026 - 09:08 vuln.today
CVSS changed
May 13, 2026 - 19:22 NVD
7.3 (HIGH)
CVE Published
May 12, 2026 - 12:36 nvd
UNKNOWN (no severity yet)

DescriptionCVE.org

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.

AnalysisAI

Memory corruption in Mozilla Firefox's WebAssembly JavaScript engine component allows remote attackers to trigger a use-after-free condition via crafted web content, with limited impact across confidentiality, integrity, and availability. The flaw affects Firefox versions prior to 150.0.3 and has no public exploit identified at time of analysis, though SSVC indicates the issue is automatable. EPSS scoring (0.02%, 5th percentile) suggests very low near-term exploitation probability despite the network-reachable attack vector.

Technical ContextAI

The vulnerability resides in Firefox's WebAssembly (Wasm) implementation inside the SpiderMonkey JavaScript engine, which compiles and executes low-level bytecode delivered from web pages. CWE-416 (Use-After-Free) indicates that the Wasm component references memory after it has been freed, typically due to incorrect object lifetime management during compilation, garbage collection interaction, or instance teardown. The CPE (cpe:2.3:a:mozilla:firefox:*) confirms the desktop browser is in scope, and tags referencing Red Hat and SUSE indicate downstream Linux distribution rebuilds inherit the flaw. Use-after-free in browser JIT/Wasm code historically enables type confusion and controlled memory reuse that can escalate from information disclosure to code execution under the right heap-grooming conditions.

RemediationAI

Vendor-released patch: Firefox 150.0.3 - upgrade affected installations immediately by consulting MFSA2026-45 at https://www.mozilla.org/security/advisories/mfsa2026-45/ and the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-8390. Enterprise deployments using Red Hat or SUSE-packaged Firefox should apply the corresponding distribution security update once published. As a temporary compensating control until patching is complete, administrators can disable WebAssembly in about:config by setting javascript.options.wasm to false, which eliminates the vulnerable code path but will break sites that depend on Wasm (including some productivity, gaming, and crypto applications); alternatively, network-level controls can restrict browsing to allowlisted internal sites to reduce drive-by exposure, at the cost of broad usability impact.

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Same weakness CWE-416 – Use After Free

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: High
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-2026-29465 vulnerability details – vuln.today
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