CVE-2026-8956
Integer Overflow in Firefox Networking JAR Component
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 | to 151.0.0 (exc) |
| mozilla | firefox | to 140.11.0 (exc) |
| mozilla | thunderbird | to 151.0.0 (exc) |
| mozilla | thunderbird | to 140.11 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-190 | The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an integer overflow in the Networking: JAR component of Mozilla Firefox. An integer overflow occurs when a calculation exceeds the maximum size that can be stored in an integer variable, potentially leading to unexpected behavior or security issues. This specific vulnerability was addressed and fixed in Firefox version 151 and Firefox ESR 140.11.
How can this vulnerability impact me? :
An integer overflow in a networking component like the JAR handler could potentially be exploited to cause crashes, memory corruption, or other unintended behavior in the browser. This might allow attackers to execute arbitrary code, disrupt service, or compromise the security of the affected system. However, specific impacts are not detailed in the provided information.
What immediate steps should I take to mitigate this vulnerability?
The vulnerability was fixed in Firefox 151 and Firefox ESR 140.11. To mitigate this vulnerability, you should update your Firefox or Firefox ESR browser to at least these versions.