CVE-2026-15718

Invalid pointer in the JavaScript: WebAssembly component

State: Published
Severity: 4.3 Medium
Published: Jul 14, 2026
Updated: Jul 22, 2026
Reserved: Jul 14, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N	CISA-ADP

Weaknesses

CWE-763 Release of Invalid Pointer or Reference

Affected Products

Product	Versions
FirefoxMozilla	140.13 through 140.*Not affected 152.0.6 and laterNot affected
ThunderbirdMozilla	140.13 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2045443
https://www.mozilla.org/security/advisories/mfsa2026-67/
https://www.mozilla.org/security/advisories/mfsa2026-70/
https://www.mozilla.org/security/advisories/mfsa2026-72/

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