CVE-2025-1933

firefox: JIT corruption of WASM i32 return values on 64-bit CPUs

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Severity

Important

Red Hat Product Security

7.6

CVSS 3.1

Review impact separately from score.

Published · March 4, 2025

Updated · March 26, 2026

Description

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: On 64-bit CPUs, when the JIT compiles WASM i32 return values they can pick up bits from left over memory. This can potentially cause them to be treated as a different type.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')