PT-2026-61918 · Mozilla · Firefox

Rintaro Kawasugi · CVE-2026-16406 · Published 2026-07-21 · Updated 2026-07-21

NVD

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153.

Fix

Protection Mechanism Failure

Weakness Enumeration

CWE-693

Related Identifiers

CVE-2026-16406

Affected Products

Firefox

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-16406 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-68 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=2040382 · Note