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Ubuntu 26.04 LTS sslh Important File Overwrite Security Advisory USN-8360-1

ubuntu
Calendar Grey June 1, 2026
Dist Ubuntu Esm H88
A severe issue in sslh allows local attackers to overwrite files in multiple Ubuntu LTS versions. Update now!
sslh could be made to overwrite files.

Summary

sslh could be made to overwrite files.

Software Description:

- sslh: Applicative protocol multiplexer

Details:

It was discovered that sslh did not properly handle symbolic

links when writing its PID file. A local attacker could

possibly use this issue to overwrite arbitrary files.

Topics%20covered

Topics Covered

security advisory file overwrite Ubuntu important local attack sslh

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  sslh                            2.1.4-1ubuntu0.26.04.1

Ubuntu 25.10
  sslh                            2.1.4-1ubuntu0.25.10.1

Ubuntu 24.04 LTS
  sslh                            1.22c-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  sslh                            1.20-1+deb11u1build0.22.04.1

Ubuntu 20.04 LTS
  sslh                            1.20-1+deb11u1build0.20.04.1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  sslh                            1.18-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  sslh                            1.17-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro

After a standard system update you need to restart sslh to
make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8360-1

CVE-2025-52936

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8360-1

Topics%20covered

Topics Covered

security advisory file overwrite Ubuntu important local attack sslh

Package Information

https://launchpad.net/ubuntu/+source/sslh/2.1.4-1ubuntu0.26.04.1
https://launchpad.net/ubuntu/+source/sslh/2.1.4-1ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/sslh/1.20-1+deb11u1build0.22.04.1

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