Quick answers
- Is CVE-2026-109762 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109762 being exploited in the wild.
- How severe is CVE-2026-109762?
- Informational severity, published 13 October 2026.
- Which products and versions are affected?
- Mozilla Firefox before 158; Mozilla Firefox ESR before 153.5; Mozilla Thunderbird before 158; Mozilla Thunderbird ESR before 153.5.
- Is there a fix for CVE-2026-109762?
- Yes: fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-109762 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-109762?
- Check whether you run Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5
Technical details
Incorrect boundary conditions in the SVG rendering component can lead to out-of-bounds memory access. The vulnerability is triggered through SVG content rendering and fixed in Firefox 158 and Firefox ESR 153.5. No public exploit details are available, but memory corruption flaws in this class typically allow code execution in the renderer process.
Affected products
- Mozilla Firefox before 158
- Mozilla Firefox ESR before 153.5
- Mozilla Thunderbird before 158
- Mozilla Thunderbird ESR before 153.5
Timeline
- 2026-10-13: disclosed