CVE-2026-5732 Incorrect boundary conditions, integer overflow in the Graphics: Text component

What is CVE-2026-5732?

CVE-2026-5732 is a high-severity vulnerability in Mozilla Firefox, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

Weakness: CWE-190

Which versions are affected by CVE-2026-5732?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2026-5732?

Upgrade to a fixed version.

Is CVE-2026-5732 being exploited?

There is no known exploitation of CVE-2026-5732 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-2026-5732, GHSA-mj57-mxq8-qvw9, UBUNTU-CVE-2026-5732.