Vulnerability · Published Oct 27, 2026 · Assigned by suse
CVE-2026-109088libXtst RECORD EnableContext Reply Endless Loop
Medium 6.5
In plain English
A medium-severity infinite loop in libXtst from X.org. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 80.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | libxtst | 1.2.6-r0 | ALPINE-CVE-2026-109088 |
| Debian:12 | libxtst | no fix listed | DEBIAN-CVE-2026-109088 |
| Debian:13 | libxtst | no fix listed | DEBIAN-CVE-2026-109088 |
| Debian:14 | libxtst | 2:1.2.6-1 | DEBIAN-CVE-2026-109088 |
| Ubuntu:22.04:LTS | libxtst | no fix listed | UBUNTU-CVE-2026-109088 |
| Ubuntu:24.04:LTS | libxtst | no fix listed | UBUNTU-CVE-2026-109088 |
| Ubuntu:26.04:LTS | libxtst | no fix listed | UBUNTU-CVE-2026-109088 |
| Ubuntu:26.10 | libxtst | no fix listed | UBUNTU-CVE-2026-109088 |
Affected products (as reported)
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H