Quick answers
- Is CVE-2026-118026 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118026 being exploited in the wild.
- How severe is CVE-2026-118026?
- Informational severity, published 27 October 2026.
- Which products and versions are affected?
- Mozilla Firefox before 159.
- Is there a fix for CVE-2026-118026?
- Yes: fixed in Firefox 159. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118026 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-118026?
- Check whether you run Mozilla Firefox 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 159
Technical details
An invalid pointer vulnerability exists in the JavaScript garbage collection (GC) component of Firefox. The vulnerability allows an attacker with network access to trigger unsafe memory operations through malicious JavaScript code executed in the browser context, potentially leading to denial of service or code execution depending on exploitation feasibility.
Affected products
- Mozilla Firefox before 159
Timeline
- 2026-10-27: disclosed
- 2026-10-27: patched: Fixed in Firefox 159