Quick answers
- Is CVE-2026-16368 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-16368 being exploited in the wild.
- How severe is CVE-2026-16368?
- Informational severity, with a CVSS score of 8.8, published 21 July 2026.
- Which products and versions are affected?
- Mozilla Firefox < 153; Mozilla Firefox ESR < 140.13.
- Is there a fix for CVE-2026-16368?
- A patch was published on 2026-07-21. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-16368 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-16368?
- Check whether you run Mozilla Firefox or Mozilla Firefox ESR 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.
Technical details
An incorrect boundary condition vulnerability exists in the JavaScript: WebAssembly component of Mozilla Firefox. The flaw is rooted in improper validation of array or buffer boundaries during WebAssembly execution. An attacker can exploit this by enticing a user to visit a malicious website containing specially crafted WebAssembly code. Successful exploitation could lead to memory corruption, potentially allowing for arbitrary code execution within the context of the browser process or a denial-of-service (browser crash). The vulnerability is addressed in Firefox 153 and Firefox ESR 140.13.
Affected products
- Mozilla Firefox < 153
- Mozilla Firefox ESR < 140.13
Timeline
- 2026-07-21: disclosed
- 2026-07-21: patched
- 2026-07-21: advisory