# telnet security updates

Patch Radar has 7 security fixes for telnet, closing 5 CVEs, 1 of which is being exploited. The newest is telnet 0.17+2.5-3ubuntu4.2 (0.17+2.5-3ubuntu4.2), released March 16, 2026.

- Web page: https://patchblox.com/security/product/linux/telnet
- Platform: Linux
- Supported: yes

## Security fixes, newest first

| Fix | Released | Fixed in | Priority | CVEs | Exploited |
|---|---|---|---|---:|---:|
| [telnet 0.17+2.5-3ubuntu4.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-telnet-0.17-2.5-3ubuntu4.2.md) | Mar 16, 2026 | Ubuntu 24.04.5 LTS (noble) 0.17+2.5-3ubuntu4.2 | Urgent | 3 | 0 |
| [telnet 0.17+2.6-1ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-telnet-0.17-2.6-1ubuntu3.2.md) | Mar 16, 2026 | Ubuntu 25.10 (questing) 0.17+2.6-1ubuntu3.2 | Urgent | 3 | 0 |
| [telnet 0.17+2.5-3ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-telnet-0.17-2.5-3ubuntu4.1.md) | Jan 20, 2026 | Ubuntu 24.04.5 LTS (noble) 0.17+2.5-3ubuntu4.1 | Patch now | 1 | 1 |
| [telnet 0.17+2.6-1ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-telnet-0.17-2.6-1ubuntu3.1.md) | Jan 20, 2026 | Ubuntu 25.10 (questing) 0.17+2.6-1ubuntu3.1 | Patch now | 1 | 1 |
| [telnet 0.17+2.5-5ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-telnet-0.17-2.5-5ubuntu1.md) | Jan 16, 2026 | Ubuntu 25.04 (plucky) 0.17+2.5-5ubuntu1 | High | 1 | 0 |
| [telnet 0.17+2.5-3ubuntu4](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-telnet-0.17-2.5-3ubuntu4.md) | Jan 16, 2026 | Ubuntu 24.10 (oracular) 0.17+2.5-3ubuntu4 | High | 1 | 0 |
| [telnet 0.17+2.4-3ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-telnet-0.17-2.4-3ubuntu1.md) | Aug 13, 2023 | Ubuntu 24.04.5 LTS (noble) 0.17+2.4-3ubuntu1 | High | 1 | 0 |

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Data as of 2026-11-07T00:32:44Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo