Quick answers
- Is CVE-2026-109089 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109089 being exploited in the wild.
- How severe is CVE-2026-109089?
- 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-2026-109089?
- 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-2026-109089 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-109089?
- 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
A heap buffer overflow occurs in libXi's XGetDeviceControl function when processing DEVICE_RESOLUTION control responses from an X server. The vulnerability arises because the size and fill operations use different values to key off the control type, allowing a hostile server to respond with a DEVICE_RESOLUTION control that has a small fixed-size but still trigger an unbounded valuator copy. The fix requires validation that the reply control type matches the request type before performing the copy operation.
Affected products
- X.Org libXi before 1.8.4
Timeline
- 2026-10-27: disclosed
- 2026-10-01: patched