Quick answers
- Is CVE-2026-109090 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109090 being exploited in the wild.
- How severe is CVE-2026-109090?
- High severity, with a CVSS score of 7.5, published 27 October 2026.
- Which products and versions are affected?
- X.Org libXi before 1.8.4.
- Is there a fix for CVE-2026-109090?
- Yes: fixed in libXi 1.8.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-109090 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-109090?
- Check whether you run X.Org libXi 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: libXi 1.8.4
Technical details
The DEVICE_ENABLE message handler in libXi's XGetDeviceControl function allocates heap memory based on the wire-format message size (8 bytes) but then writes a full XDeviceEnableState structure, causing a heap overflow. The vulnerability requires a malicious or compromised X server and affects libXi versions before 1.8.4. A fix adds proper size validation to prevent writing beyond the allocated buffer.
Affected products
- X.Org libXi before 1.8.4
Timeline
- 2026-10-27: disclosed
- 2026-10-08: patched