Critical severity · published Jul 22, 2025
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…
9.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 115.26.0; before 141.0; 128.0 before 128.13.0; 140.0 before 140.1.0 · source: NVD
TH
Thunderbird · Mozilla
before 128.13.0; before 141.0; 140.0 before 140.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-8028
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-8028
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1971581
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-56/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-57/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-58/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-59/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-61/
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