Critical· 9.8official fix available
CVE-2026-16411
This vulnerability is a memory corruption bug in Firefox 152 that could allow attackers to run arbitrary code. It was fixed in Firefox 153. The issue is critical because it requires no user interaction.
publishedJul 21, 2026
last modifiedJul 24, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
24th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 20, 2026
An official fix is available, so this entry is kept for 30 days and then removed automatically.
01
Who is affected
Mozilla Firefox 152 and earlier (and Thunderbird 152 and earlier).
02
Real-world impact
An attacker could potentially execute malicious code on a victim’s computer by exploiting the memory corruption, leading to full system compromise.
03
Why this severity
The CVSS score of 9.8 reflects that the flaw can be exploited remotely without authentication or user interaction, and it can compromise confidentiality, integrity, and availability.
04
What to do about it
official fix available
recommended steps
- 01Upgrade Firefox to version 153 or later.
- 02Restart the browser.
NVD-referenced vendor advisory
05
Timeline
- Jul 21, 2026 · 12d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 21, 2026 · 11d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
- Jul 24, 2026 · 9d agoAdvisory updatedThe NVD record was last revised.
06
How it’s attacked
Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07
References & advisories
- bugzilla.mozilla.org/buglist.cgibroken link
- bugzilla.mozilla.org/buglist.cgibroken link
- bugzilla.mozilla.org/buglist.cgibroken link
- mozilla.org/security/advisories/mfsa202…vendor advisory
- mozilla.org/security/advisories/mfsa202…
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →