CVE-2026-6779

Other issue in the JavaScript Engine component

State: Published
Severity: 5.3 Medium
Published: Apr 21, 2026
Updated: May 26, 2026
Reserved: Apr 21, 2026

Description

Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	CISA-ADP

Weaknesses

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-20 Improper Input Validation
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
FirefoxMozilla	150 and laterNot affected
ThunderbirdMozilla	150 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2023343
https://www.mozilla.org/security/advisories/mfsa2026-30/
https://www.mozilla.org/security/advisories/mfsa2026-33/

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