Memory Safety Bug in Firefox ESR 140.10.0 & Thunderbird 140.10.0
CVE-2026-7323 Published on April 28, 2026
Memory safety bugs fixed in Firefox ESR 140.10.1 and Firefox 150.0.1
Memory safety bugs present in Firefox ESR 140.10.0 and Firefox 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1 and Firefox ESR 140.10.1.
Vulnerability Analysis
CVE-2026-7323 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Types
What is a Buffer Overflow Vulnerability?
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.
CVE-2026-7323 has been classified to as a Buffer Overflow vulnerability or weakness.
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-7323 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-7323
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Affected Versions
Mozilla Firefox:- Version 140.10.1, <= 140.* is unaffected.
- Version 150.0.1, <= * is unaffected.