CVE-2026-4706

HIGH 7.5CVE-2026-4706 · Published 24/03/2026 · updated 17/06/2026

In short

CVE-2026-4706 is a HIGH (CVSS 7.5) vulnerability affecting firefox (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.47%, higher than 40.7% of all vulnerabilities.
Fix: update to 140.9.0, 115.34.0, 149.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`≥ 128.0, < 140.9.0< 115.34.0< 149.0`	`140.9.0115.34.0149.0`

Description

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

References

bugzilla.mozilla.org/show_bug.cgi · Permissions Required
mozilla.org/security/advisories/mfsa2026-20 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-21 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-22 · Vendor Advisory
mozilla.org/security/advisories/mfsa2026-23
mozilla.org/security/advisories/mfsa2026-24

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Package

Affected versions

Patched versions

firefox

mozilla

≥ 128.0, < 140.9.0< 115.34.0< 149.0

140.9.0115.34.0149.0

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