CVE-2025-8028

moderate-risk
Published 2025-07-22

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.

Do I need to act?

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0.18% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (4)

Affected Vendors

Mozilla

References (9)

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/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-62/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-63/
https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html
43
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 1/34 · Minimal
Exposure 10/34 · Low