CVE-2026-16389: Vulnerability in Mozilla Firefox
Incorrect boundary conditions, integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 153.
AI Analysis
Technical Summary
This vulnerability involves incorrect boundary conditions and an integer overflow within the Libraries component of the Network Security Services (NSS) used by Mozilla Firefox. Such flaws can lead to unexpected behavior or memory corruption. Mozilla fixed this vulnerability in Firefox 153 as part of a broader security update addressing multiple issues. No CVSS score is provided, but the vendor advisory classifies the impact as moderate.
Potential Impact
The vulnerability could potentially allow an attacker to cause memory corruption or other unintended behavior due to integer overflow and boundary condition errors in NSS. The Mozilla advisory rates the impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix for this vulnerability is available in Firefox version 153. Users and administrators should update to Firefox 153 or later to remediate this issue. No additional mitigation actions are indicated by the vendor advisory.
CVE-2026-16389: Vulnerability in Mozilla Firefox
Description
Incorrect boundary conditions, integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 153.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves incorrect boundary conditions and an integer overflow within the Libraries component of the Network Security Services (NSS) used by Mozilla Firefox. Such flaws can lead to unexpected behavior or memory corruption. Mozilla fixed this vulnerability in Firefox 153 as part of a broader security update addressing multiple issues. No CVSS score is provided, but the vendor advisory classifies the impact as moderate.
Potential Impact
The vulnerability could potentially allow an attacker to cause memory corruption or other unintended behavior due to integer overflow and boundary condition errors in NSS. The Mozilla advisory rates the impact as moderate. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix for this vulnerability is available in Firefox version 153. Users and administrators should update to Firefox 153 or later to remediate this issue. No additional mitigation actions are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-07-20T21:57:08.939Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/","vendor":"Mozilla"}]
Threat ID: 6a5f6cc12a4a8d5989262909
Added to database: 07/21/2026, 12:57:37 UTC
Last enriched: 07/21/2026, 13:28:00 UTC
Last updated: 07/21/2026, 21:19:15 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.