Ubuntu USN · USN-8360-1

sslh vulnerability

Published: Mon, 01 Jun 2026 15:12

CVE-2025-52936

Summary

sslh could be made to overwrite files.

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.

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu bionic

sslh→1.18-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.18-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh=1.18-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
sslh→1.18-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.18-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh=1.18-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu focal

sslh→1.20-1+deb11u1build0.20.04.1apt_upgrade
Standard apt upgrade. Install 1.20-1+deb11u1build0.20.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
sslh→1.20-1+deb11u1build0.20.04.1apt_upgrade
Standard apt upgrade. Install 1.20-1+deb11u1build0.20.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu jammy

sslh→1.20-1+deb11u1build0.22.04.1apt_upgrade
Standard apt upgrade. Install 1.20-1+deb11u1build0.22.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
sslh→1.20-1+deb11u1build0.22.04.1apt_upgrade
Standard apt upgrade. Install 1.20-1+deb11u1build0.22.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu noble

sslh→1.22c-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.22c-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh=1.22c-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
sslh→1.22c-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.22c-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh=1.22c-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu questing

sslh→2.1.4-1ubuntu0.25.10.1apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu0.25.10.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
sslh→2.1.4-1ubuntu0.25.10.1apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu0.25.10.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu resolute

sslh→2.1.4-1ubuntu0.26.04.1apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu0.26.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
sslh→2.1.4-1ubuntu0.26.04.1apt_upgrade
Standard apt upgrade. Install 2.1.4-1ubuntu0.26.04.1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu xenial

sslh→1.17-2ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.17-2ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh=1.17-2ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
sslh→1.17-2ubuntu0.1~esm1apt_upgrade_esm
Fixed at 1.17-2ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y sslh=1.17-2ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

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