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==========================================================================
Ubuntu Security Notice USN-7804-2
November 04, 2025

squid, squid3 vulnerability
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Squid could be made to crash if it received specially crafted network
traffic.

Software Description:
- squid: Web proxy cache server
- squid3: Web proxy cache server

Details:

USN-7804-1 fixed a vulnerability in Squid. This update provides the
corresponding update for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu
20.04 LTS.

Original advisory details:

 It was discovered that Squid incorrectly handled certain long SNMP OIDs. A
 remote attacker could possibly use this issue to cause Squid to crash,
 resulting in a denial of service.

Update instructions:

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

Ubuntu 20.04 LTS
  squid                           4.10-1ubuntu1.13+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  squid                           3.5.27-1ubuntu1.14+esm5
                                  Available with Ubuntu Pro
  squid3                          3.5.27-1ubuntu1.14+esm5
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  squid                           3.5.12-1ubuntu7.16+esm6
                                  Available with Ubuntu Pro
  squid3                          3.5.12-1ubuntu7.16+esm6
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7804-2
  https://ubuntu.com/security/notices/USN-7804-1
  CVE-2025-59362

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