CVE-2026-12301: Memory safety bug fixed in Thunderbird 152
Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 152 - Upgrade
Upgrade
Mozilla Firefoxto a version that resolves this vulnerability.Fixed in 152 - Upgrade
Upgrade
Mozilla Thunderbirdto a version that resolves this vulnerability.Fixed in 152
Event History
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-12289
- CVE-2026-12290
- CVE-2026-12291
- CVE-2026-12292
- CVE-2026-12293
- CVE-2026-12294
- CVE-2026-12295
- CVE-2026-12296
- CVE-2026-12297
- CVE-2026-12298
- CVE-2026-12299
- CVE-2026-12300
- CVE-2026-12301
- CVE-2026-12302
- CVE-2026-12303
- CVE-2026-12304
- CVE-2026-12305
- CVE-2026-12306
- CVE-2026-12307
- CVE-2026-12308
- CVE-2026-12309
- CVE-2026-12310
- CVE-2026-12311
- CVE-2026-12312
- CVE-2026-12313
- CVE-2026-12314
- CVE-2026-12315
- CVE-2026-12316
- CVE-2026-12317
- CVE-2026-12318
- CVE-2026-12319
- CVE-2026-12320
- CVE-2026-12321
- CVE-2026-12322
- CVE-2026-12323
- CVE-2026-12324
- CVE-2026-12325
- CVE-2026-12326
- CVE-2026-12327
- CVE-2026-12328
Frequently Asked Questions
What is the severity of CVE-2026-12301?
The severity of CVE-2026-12301 is classified as medium with a score of 5.3 according to the CVSS 3.1 system.
How do I fix CVE-2026-12301?
To fix CVE-2026-12301, update Mozilla Firefox and Mozilla Thunderbird to version 152 or later.
What type of vulnerability is CVE-2026-12301?
CVE-2026-12301 is a memory safety bug categorized under buffer overflow.
Which software is affected by CVE-2026-12301?
CVE-2026-12301 affects Mozilla Firefox and Mozilla Thunderbird versions prior to 152.
When was CVE-2026-12301 published?
CVE-2026-12301 was published on June 16, 2026.