CVE-2026-15718

MediumPublished

Invalid pointer in the JavaScript: WebAssembly component

Published: Jul 14, 2026
Updated: Jul 22, 2026
Assigning CNA: mozilla
Evidence observed: Aug 24, 2026

Primary CVSS

4.3/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 41.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-15718-who-put-ptrs-in-my-wasmExploit
PoC exploit chain for CVE-2026-15718: SpiderMonkey wasm baseline compiler array.fill missing-sync -> invalid pointer -> addrOf/fakeobj -> arbitrary R/W -> RCE

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