Platform
firefox
Component
firefox
Fixed in
149.0.2
149.0.2
CVE-2026-5732 represents an Integer Overflow vulnerability discovered within the Graphics: Text component of Mozilla Firefox. This flaw arises from incorrect boundary condition handling, potentially leading to unexpected behavior or crashes. The vulnerability impacts versions of Firefox prior to 149.0.2, including 140.9.1 and related ESR versions. A patch addressing this issue has been released in Firefox 149.0.2, Thunderbird 149.0.2, and Thunderbird 140.9.1.
CVE-2026-5732 in Firefox affects the Graphics: Text component due to incorrect boundary conditions and an integer overflow. This could potentially allow an attacker, under specific circumstances, to execute arbitrary code on the user's system. While the exact nature of exploitation hasn't been publicly detailed, integer overflows are frequently leveraged to overwrite memory and gain control of program execution. The potential impact is significant, potentially compromising the confidentiality, integrity, and availability of user data. The vulnerability has been addressed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1. Applying these updates promptly is crucial to mitigate the risk.
The exploitation context for CVE-2026-5732 is currently unknown. However, given the vulnerability's location in text handling within the graphics component, exploitation likely involves manipulating text sources or displaying malicious content. An attacker might attempt to inject specially crafted data into a webpage or document to trigger the integer overflow. The lack of public details about exploitation makes it difficult to predict precisely how this vulnerability could be used, but updating is essential to prevent potential attacks.
Exploit Status
EPSS
0.04% (13% percentile)
The primary mitigation for CVE-2026-5732 is to update to the latest version of Firefox, Firefox ESR, Thunderbird, or Thunderbird, as applicable. Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1 contain the fix. Additionally, keeping your operating system and other software updated helps reduce the attack surface. If immediate updating isn't possible, consider restricting access to potentially malicious websites and disabling features that could be exploited, although this may impact functionality. Timely patching remains the best defense against this type of vulnerability.
Update to Firefox version 149.0.2 or later to mitigate the risk of integer overflow and incorrect boundary conditions in the graphics text component. It is also recommended to update Thunderbird to version 149.0.2 or 140.9.1.
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An integer overflow occurs when the result of an arithmetic operation exceeds the maximum capacity of the data type used to store it. This can lead to unexpected behavior and, in some cases, the execution of malicious code.
Yes, Firefox ESR is also affected. Version 140.9.1 contains the fix.
If you can't update immediately, limit your exposure to potentially malicious websites and consider disabling features that might be vulnerable.
No temporary patch has been released. Updating to the fixed version is the only available mitigation currently.
In Firefox, go to 'Help' > 'About Firefox'. Your current version will be displayed.
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