CVE-2025-10533 Integer overflow in the SVG component

What is CVE-2025-10533?

CVE-2025-10533 is a high-severity vulnerability in Mozilla Firefox, published on 16 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Integer overflow in the SVG component. This vulnerability was fixed in Firefox 143, Firefox ESR 115.28, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.

Weakness: CWE-190

Which versions are affected by CVE-2025-10533?

It affects 2 products.

Products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2025-10533?

Upgrade to a fixed version.

Is CVE-2025-10533 being exploited?

There is no known exploitation of CVE-2025-10533 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2025-10533, GHSA-wjhw-rxqj-2g2h, UBUNTU-CVE-2025-10533.