USN-8359-1: NNCP vulnerability

Publication date

1 June 2026

Overview

NNCP could allow unintended access to files.


Packages

  • nncp - package facilitating secure store-and-forward file and mail exchange

Details

It was discovered that NNCP did not properly sanitize file paths
in packet data during file requesting and file saving operations. A
remote attacker could possibly use this issue to read or write
arbitrary files outside of the intended directory.

It was discovered that NNCP did not properly sanitize file paths
in packet data during file requesting and file saving operations. A
remote attacker could possibly use this issue to read or write
arbitrary files outside of the intended directory.

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
25.10 questing nncp –  8.11.0-4+deb13u1build0.25.10.1
24.04 LTS noble nncp –  8.10.0-8ubuntu0.3+esm3  
22.04 LTS jammy nncp –  8.5.0-1ubuntu0.1+esm3  

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