CVE-2025-8028

firefox: thunderbird: Large branch table could lead to truncated instruction

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · July 23, 2025

Updated · June 30, 2026

Description

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: On arm64, a WASM <code>br_table</code> instruction with a large number of entries could lead to the label being too far from the instruction, causing truncation and incorrect computation of the branch address.

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 · 7.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-1332 · Improper Handling of Faults that Lead to Instruction Skips