CVE-2026-15718

Invalid pointer in the JavaScript: WebAssembly component

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 140.13, and Thunderbird 140.13.

Affected

Mozilla · Firefox · Thunderbird

CVSS v3.1 CNA

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS

0.49% chance of exploitation in the next 30 days, 41st percentile

Published

2026-07-14

Updated

2026-07-22

Proof-of-concept exploits (1)

• SneakyNachos/CVE-2026-15718-who-put-ptrs-in-my-wasm1★ · 2026-08-23

Security advisories

• https://www.mozilla.org/security/advisories/mfsa2026-67

References

• CVE Record
• NVD entry

Related

• CVE-2024-29943
• CVE-2026-12295
• CVE-2026-2764
• CVE-2026-2766
• CVE-2026-2796
• CVE-2026-4692