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[USN-8511-1] socat vulnerabilities

Posted on 06 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8511-1
July 06, 2026

socat vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in socat.

Software Description:
- 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)

Update instructions:

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

Ubuntu 26.04 LTS
socat 1.8.1.1-1ubuntu0.1

Ubuntu 24.04 LTS
socat 1.8.0.0-4ubuntu0.1

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

References:
https://ubuntu.com/security/notices/USN-8511-1
CVE-2024-54661, CVE-2026-56123

Package Information:
https://launchpad.net/ubuntu/+source/socat/1.8.1.1-1ubuntu0.1
https://launchpad.net/ubuntu/+source/socat/1.8.0.0-4ubuntu0.1

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