Memory Safety Bugs in Firefox Affecting Mozilla
CVE-2026-16411

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
21 July 2026

What is CVE-2026-16411?

Multiple memory safety bugs discovered in Firefox 152 present a risk of memory corruption. While exploitation is not straightforward, successful execution may enable arbitrary code to run. Mozilla addressed these vulnerabilities in Firefox 153, enhancing the security posture of users by mitigating these potential risks.

Affected Version(s)

Firefox 153

Thunderbird 153

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1420800%2...
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2006467%2...
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2048936%2...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

C.M.Chang, Christian Holler, David Parks, Dennis Jackson, Gabriele Svelto, Hafiizh, Henrik Skupin, Jan de Mooij, Jens Stutte, Paul Theriault, Randell Jesup, Rob Wu, Tom Ritter, Tom Schuster and the Mozilla Fuzzing Team
.