CVE-2025-10528 Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component
An attacker can escape the browser sandbox via invalid pointer handling in Canvas2D, potentially executing arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-10528?
CVE-2025-10528 is a high-severity memory corruption vulnerability in Mozilla Firefox, published on 16 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
Weakness: CWE-693
Which versions are affected by CVE-2025-10528?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2025-10528?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-10528 being exploited?
There is no known exploitation of CVE-2025-10528 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2025-10528, GHSA-5qj7-cv36-4gxh, UBUNTU-CVE-2025-10528.