CVE-2026-12330: Vulnerability in Mozilla Firefox
Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.
AI Analysis
Technical Summary
This vulnerability involves incorrect boundary conditions in the Internationalization component of Mozilla Firefox, which could potentially lead to memory safety issues. It is classified under CWE-119, indicating a buffer boundary error. The issue was addressed and fixed in Firefox ESR 140.12 and Firefox ESR 115.37, as well as Thunderbird 140.12. The CVSS 3.1 vector indicates the vulnerability is remotely exploitable without privileges, requires user interaction, and impacts confidentiality and integrity with no impact on availability.
Potential Impact
The vulnerability could allow an attacker to cause limited confidentiality and integrity impacts due to incorrect boundary checks in the Internationalization component. The CVSS score of 5.4 reflects a medium severity risk. There are no reports of active exploitation in the wild. The flaw could potentially be leveraged to read or alter data improperly within the affected component.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12. Users and administrators should upgrade to these versions or later to remediate the issue. Since the vulnerability is fixed in these ESR releases, no additional mitigation steps are required beyond applying the official updates.
CVE-2026-12330: Vulnerability in Mozilla Firefox
Description
Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12.
CVSS v3.1
Score 5.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves incorrect boundary conditions in the Internationalization component of Mozilla Firefox, which could potentially lead to memory safety issues. It is classified under CWE-119, indicating a buffer boundary error. The issue was addressed and fixed in Firefox ESR 140.12 and Firefox ESR 115.37, as well as Thunderbird 140.12. The CVSS 3.1 vector indicates the vulnerability is remotely exploitable without privileges, requires user interaction, and impacts confidentiality and integrity with no impact on availability.
Potential Impact
The vulnerability could allow an attacker to cause limited confidentiality and integrity impacts due to incorrect boundary checks in the Internationalization component. The CVSS score of 5.4 reflects a medium severity risk. There are no reports of active exploitation in the wild. The flaw could potentially be leveraged to read or alter data improperly within the affected component.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox ESR 140.12, Firefox ESR 115.37, and Thunderbird 140.12. Users and administrators should upgrade to these versions or later to remediate the issue. Since the vulnerability is fixed in these ESR releases, no additional mitigation steps are required beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-06-15T15:08:22.804Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-58/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-59/","vendor":"Mozilla"}]
Threat ID: 6a314c870b89be6888b4cf50
Added to database: 06/16/2026, 13:15:51 UTC
Last enriched: 06/17/2026, 08:16:53 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 70
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.