Vulnerability · Published Jul 22, 2025 · Assigned by mozilla
CVE-2025-8028Large branch table could lead to truncated instruction
Critical 9.8
In plain English
A critical-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | firefox | 128.13.0-1.el10_0 | ALSA-2025:11797 |
| AlmaLinux:8 | firefox | 128.13.0-1.el8_10.alma.1 | ALSA-2025:11747 |
| AlmaLinux:9 | firefox | 128.13.0-1.el9_6.alma.1 | ALSA-2025:11748 |
| AlmaLinux:9 | firefox-x11 | 128.13.0-1.el9_6.alma.1 | ALSA-2025:11748 |
| AlmaLinux:10 | thunderbird | 128.13.0-3.el10_0.alma.1 | ALSA-2025:12188 |
| AlmaLinux:8 | thunderbird | 128.13.0-3.el8_10.alma.1 | ALSA-2025:13676 |
| AlmaLinux:9 | thunderbird | 128.13.0-3.el9_6.alma.1 | ALSA-2025:12187 |
| Debian:12 | firefox-esr | 128.13.0esr-1~deb12u1 | DEBIAN-CVE-2025-8028 |
| Debian:12 | firefox-esr | 128.13.0esr-1~deb12u1 | DSA-5964-1 |
| Debian:13 | firefox-esr | 128.13.0esr-1 | DEBIAN-CVE-2025-8028 |
| Debian:14 | firefox-esr | 128.13.0esr-1 | DEBIAN-CVE-2025-8028 |
| Debian:12 | thunderbird | 1:128.13.0esr-1~deb12u1 | DSA-5966-1 |
| Debian:12 | thunderbird | 1:128.13.0esr-1~deb12u1 | DEBIAN-CVE-2025-8028 |
| Debian:13 | thunderbird | 1:128.13.0esr-1 | DEBIAN-CVE-2025-8028 |
| Debian:14 | thunderbird | 1:128.13.0esr-1 | DEBIAN-CVE-2025-8028 |
| Rocky Linux:10 | firefox | 0:128.13.0-1.el10_0 | RLSA-2025:11797 |
| Rocky Linux:8 | firefox | 0:128.13.0-1.el8_10 | RLSA-2025:11747 |
| Rocky Linux:9 | firefox | 0:128.13.0-1.el9_6 | RLSA-2025:11748 |
| Rocky Linux:10 | thunderbird | 0:128.13.0-3.el10_0 | RLSA-2025:12188 |
| Rocky Linux:8 | thunderbird | 0:128.13.0-3.el8_10 | RLSA-2025:13676 |
| Rocky Linux:9 | thunderbird | 0:128.13.0-3.el9_6 | RLSA-2025:12187 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-8028 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2025-8028 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2025-8028 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2025-8028 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2025-8028 |
| Ubuntu:22.04:LTS | thunderbird | 1:140.7.1+build1-0ubuntu0.22.04.1 | UBUNTU-CVE-2025-8028 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-1332 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1971581
- 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/
- https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html