CVE-2026-6757

Invalid pointer in the JavaScript: WebAssembly component

State: Published
Severity: 6.3 Medium
Published: Apr 21, 2026
Updated: May 26, 2026
Reserved: Apr 21, 2026

Description

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Scores

CVSS	Score	Vector	Source
3.1	6.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L	CISA-ADP

Weaknesses

CWE-824 Access of Uninitialized Pointer

Affected Products

Product	Versions
FirefoxMozilla	140.10 through 140.*Not affected 150 and laterNot affected
ThunderbirdMozilla	140.10 through 140.*Not affected 150 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2013588
https://www.mozilla.org/security/advisories/mfsa2026-30/
https://www.mozilla.org/security/advisories/mfsa2026-32/
https://www.mozilla.org/security/advisories/mfsa2026-33/
https://www.mozilla.org/security/advisories/mfsa2026-34/

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