Client crashes via XIM trigger-key overread
Published Sep 28, 2026 · Updated Sep 28, 2026
Out-of-bounds read in X.Org libX11 before 1.8.14 allows attackers controlling an X server to crash connected X clients. The XIM trigger-key registration parser reads beyond the bounds of data supplied by the server; the exact failed length check is not publicly described. A client must connect to a malicious or compromised X server and process its XIM registration message; the reported consequence is a client crash.
Summary
What happened
Out-of-bounds read in X.Org libX11 before 1.8.14 allows attackers controlling an X server to crash connected X clients. The XIM trigger-key registration parser reads beyond the bounds of data supplied by the server; the exact failed length check is not publicly described. A client must connect to a malicious or compromised X server and process its XIM registration message; the reported consequence is a client crash.
The record
- CVE
- CVE-2026-94284
- Published
- Sep 28, 2026
- Updated
- Sep 28, 2026
- Vendor
- The X11 Project
- Product
- libX11
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 28, 2026CVE publishedPublication date reported by the CVE source.
- Sep 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.8.14
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
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