CVE-2026-12290
Modified Modified - Updated After Analysis

Memory Corruption Bug in Firefox

Publication date: 2026-06-16

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description
Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

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Meta Information

Published
2026-06-16
Last Modified
2026-06-30
Generated
2026-07-06
AI Q&A
2026-06-16
EPSS Evaluated
2026-07-05
NVD
CVE-2026-12290
EUVD
EUVD-2026-37081

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox 152
mozilla firefox_esr 140.12
mozilla firefox_esr 115.37

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-823 The product performs pointer arithmetic on a valid pointer, but it uses an offset that can point outside of the intended range of valid memory locations for the resulting pointer.

Attack-Flow Graph

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Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 152 or later, or update Firefox ESR to version 140.12 or later, or ESR 115.37 or later.

Executive Summary

This vulnerability is a memory safety bug that was present in Mozilla Firefox. It was addressed and fixed in Firefox version 152, as well as in Firefox ESR versions 140.12 and 115.37.

Impact Analysis

CVE-2026-12290 is a memory safety bug fixed in Firefox 152 and Firefox ESR versions 140.12 and 115.37.

While the provided resources focus on CVE-2026-12289, which is a high-impact privilege escalation vulnerability, there is no detailed information about the specific impact of CVE-2026-12290.

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