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Vulnerabilities

Vulnerability · USN-8939-1

libxtst vulnerabilities

Published Oct 19, 2026 · catalog updated Oct 20, 2026 · libxtst vulnerabilities

Open the advisory

Exploitation likelihood is not on this record for USN-8939-1. A missing EPSS score is not a low risk. Compare libxtst vulnerabilities with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (libxtst vulnerabilities).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
Ubuntu:22.04:LTS libxtst · Ubuntu:24.04:LTS libxtst · Ubuntu:26.04:LTS libxtst · Ubuntu:26.10 libxtst · Ubuntu:Pro:16.04:LTS libxtst · Ubuntu:Pro:18.04:LTS libxtst

It was discovered that libXtst did not properly handle certain RECORD replies from the X server. A malicious X server could possibly use this issue to cause libXtst clients to crash, resulting in a denial of service. (CVE-2026-94286) Tobias Stoeckmann discovered that libXtst did not properly handle certain memory operations. A malicious X server could possibly use this issue to cause libXtst to access memory out of bounds, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7951) Tobias Stoeckmann discovered that libXtst did not properly handle certain replies from the X server. A malicious X server could possibly use this issue to cause libXtst to enter an infinite loop, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS. (CVE-2016-7952)

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Ubuntu:22.04:LTS libxtst0 → 2:1.2.3-1ubuntu0.22.04.1
  • Ubuntu:24.04:LTS libxtst0 → 2:1.2.3-1.1ubuntu0.1
  • Ubuntu:26.04:LTS libxtst0 → 2:1.2.5-1ubuntu0.1
  • Ubuntu:26.10 libxtst0 → 2:1.2.5-1ubuntu1
  • Ubuntu:Pro:16.04:LTS libxtst0 → 2:1.2.2-1ubuntu0.1~esm1
  • Ubuntu:Pro:18.04:LTS libxtst0 → 2:1.2.3-1ubuntu0.18.04.1~esm1
  • Ubuntu:Pro:20.04:LTS libxtst0 → 2:1.2.3-1ubuntu0.20.04.1~esm1

How to fix USN-8939-1

  • Recommended remediation

    A patch or advisory reference is linked. Open the original publisher for availability by product version.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for USN-8939-1. A missing EPSS score is not a low risk. Compare libxtst vulnerabilities with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 2:1.2.3-1ubuntu0.22.04.1, 0 → 2:1.2.3-1.1ubuntu0.1, 0 → 2:1.2.5-1ubuntu0.1, 0 → 2:1.2.5-1ubuntu1, 0 → 2:1.2.2-1ubuntu0.1~esm1, 0 → 2:1.2.3-1ubuntu0.18.04.1~esm1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 19, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    It was discovered that libXtst did not properly handle certain RECORD replies from the X server. A malicious X server could possibly use this issue to cause libXtst clients to crash, resulting in a denial of service. (CVE-2026-94286) Tobias Stoeckmann discovered that libXtst did not properly handle certain memory operations. A malicious X server could possibly use this issue to cause libXtst to ac

  2. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.2-1ubuntu0.1~esm1; libxtst fixed in 2:1.2.3-1ubuntu0.18.04.1~esm1; libxtst fixed in 2:1.2.3-1ubuntu0.20.04.1~esm1; libxtst fixed in 2:1.2.3-1ubuntu0.22.04.1

  3. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.2-1ubuntu0.1~esm1

  4. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.3-1ubuntu0.18.04.1~esm1

  5. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.3-1ubuntu0.20.04.1~esm1

  6. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.3-1ubuntu0.22.04.1

  7. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.3-1.1ubuntu0.1

  8. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.5-1ubuntu1

  9. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libxtst fixed in 2:1.2.5-1ubuntu0.1

  10. Oct 20, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    It was discovered that libXtst did not properly handle certain RECORD replies from the X server. A malicious X server could possibly use this issue to cause libXtst clients to crash, resulting in a denial of service. (CVE-2026-94286) Tobias Stoeckmann discovered that libXtst did not properly handle certain memory operations. A malicious X server could possibly use this issue to cause libXtst to ac

Sources

References

Freshness

Last verified in this catalog Oct 20, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.