CVE-2026-8975
Memory Corruption in Mozilla Firefox
Publication date: 2026-05-19
Last updated on: 2026-05-20
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | From 140.0 (inc) to 140.11.0 (exc) |
| mozilla | firefox | to 151.0.0 (exc) |
| mozilla | firefox | to 115.36.0 (exc) |
| mozilla | thunderbird | to 140.11 (exc) |
| mozilla | thunderbird | to 151.0.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided context and resources do not contain information regarding the impact of CVE-2026-8975 on compliance with common standards and regulations such as GDPR or HIPAA.
Can you explain this vulnerability to me?
This vulnerability involves memory safety bugs found in certain versions of Firefox, specifically Firefox ESR 115.35, Firefox ESR 140.10, and Firefox 150.
Some of these bugs showed evidence of memory corruption, which means that the program's memory could be improperly accessed or modified.
It is presumed that with enough effort, some of these bugs could have been exploited to run arbitrary code, potentially allowing an attacker to execute malicious actions on the affected system.
The issue was fixed in later versions: Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.
How can this vulnerability impact me? :
Exploitation of these memory safety bugs could allow an attacker to run arbitrary code on your system.
This could lead to unauthorized actions such as installing malware, stealing data, or taking control of your device.
Using updated versions of Firefox (Firefox 151, Firefox ESR 115.36, or Firefox ESR 140.11) mitigates this risk.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, update Firefox to version 151 or later, or Firefox ESR to version 115.36 or later (including ESR 140.11 or later). These versions contain the fixes for the memory safety bugs.