CVE-2025-8028: firefox — Fix

Description

On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

Is your site exposed to CVE-2025-8028?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

9.8

CRITICAL

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

Weakness Type (CWE)

CWE-1332 CWE-1332

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 115.26.0
mozilla	firefox	< 141.0
mozilla	firefox	128.0 — 128.13.0
mozilla	firefox	140.0 — 140.1.0
mozilla	thunderbird	< 128.13.0
mozilla	thunderbird	< 141.0
mozilla	thunderbird	140.0 — 140.1.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-56/ https://www.mozilla.org/security/advisories/mfsa2025-57/ https://www.mozilla.org/security/advisories/mfsa2025-58/ https://www.mozilla.org/security/advisories/mfsa2025-59/ https://www.mozilla.org/security/advisories/mfsa2025-61/ https://www.mozilla.org/security/advisories/mfsa2025-62/ https://www.mozilla.org/security/advisories/mfsa2025-63/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1971581 https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html

Frequently Asked Questions

What is CVE-2025-8028? +

On arm64, a WASM `br_table` instruction with a lot of entries could lead to the label being too far from the instruction causing truncation and incorrect computation of the branch address. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-8028? +

CVE-2025-8028 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-8028? +

CVE-2025-8028 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-8028? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2024-20059 6.7

In da, there is a possible escalation of privilege due to an incorrect status check. This could lead to local …

CVE-2024-20060 5.9

In da, there is a possible escalation of privilege due to an incorrect status check. This could lead to local …

CVE-2025-2857 10.0

Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised …

CVE-2026-41512 9.9

ai-scanner is an AI model safety scanner built on NVIDIA garak. From version 1.0.0 to before version 1.4.1, there is …

CVE-2026-6760 9.8

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

CVE-2026-8094 9.8

Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.

CVE-2025-8028