USN-8511-1: socat vulnerabilities

Publication date

6 July 2026

Overview

Several security issues were fixed in socat.


Packages

  • socat - multipurpose relay for bidirectional data transfer

Details

It was discovered that socat incorrectly handled the SOCKS5 proxy server
reply parser. A remote attacker could possibly use this issue to execute
arbitrary code. (CVE-2026-56123)

It was discovered that socat incorrectly handled a sample script. A local
attacker could possibly use this issue to overwrite arbitrary files. This
issue only affected Ubuntu 24.04 LTS. (CVE-2024-54661)

It was discovered that socat incorrectly handled the SOCKS5 proxy server
reply parser. A remote attacker could possibly use this issue to execute
arbitrary code. (CVE-2026-56123)

It was discovered that socat incorrectly handled a sample script. A local
attacker could possibly use this issue to overwrite arbitrary files. This
issue only affected Ubuntu 24.04 LTS. (CVE-2024-54661)

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
26.04 LTS resolute socat –  1.8.1.1-1ubuntu0.1
24.04 LTS noble socat –  1.8.0.0-4ubuntu0.1

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