Critical severity9.1NVD Advisory· Published Jul 21, 2026· Updated Jul 22, 2026
CVE-2026-16406
CVE-2026-16406
Description
Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Affected products
14<153+ 2 more
- (no CPE)range: <153
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <153.0.0
- (no CPE)range: before 153
- Range: before 153
- osv-coords10 versionspkg:apk/chainguard/firefoxpkg:apk/chainguard/firefox-docker-selenium-compatpkg:apk/wolfi/firefoxpkg:apk/wolfi/firefox-docker-selenium-compatpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/mozilla-nspr&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/mozilla-nss&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/rust-cbindgen&distro=openSUSE%20Leap%2016.0
< 153.0-r0+ 9 more
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.0-r0
- (no CPE)range: < 153.1.0-160000.1.2
- (no CPE)range: < 153.0-1.1
- (no CPE)range: < 153.0-1.1
- (no CPE)range: < 4.39-160000.1.1
- (no CPE)range: < 3.125-160000.1.1
- (no CPE)range: < 0.29.4+git0-160000.1.1
Patches
Vulnerability mechanics
References
3- www.mozilla.org/security/advisories/mfsa2026-68/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
- www.mozilla.org/security/advisories/mfsa2026-71/nvd
News mentions
1- Firefox 153: Mozilla Fixes 25 Coordinated Vulnerabilities in Single July 22 DisclosureVypr Intelligence · Jul 22, 2026