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[USN-8625-1] OpenSSL vulnerability

Posted on 31 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8625-1
July 30, 2026

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

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

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

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

It was discovered that OpenSSL incorrectly allocated memory buffers in the
SSL/TLS state machine when receiving handshake data. A remote attacker
could possibly use this issue to cause OpenSSL to consume excessive memory,
leading to a denial of service. This issue is known as the "HollowByte"
denial of service.

Update instructions:

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

Ubuntu 26.04 LTS
libssl3t64 3.5.5-1ubuntu3.3
openssl 3.5.5-1ubuntu3.3

Ubuntu 24.04 LTS
libssl3t64 3.0.13-0ubuntu3.12
openssl 3.0.13-0ubuntu3.12

Ubuntu 22.04 LTS
libssl3 3.0.2-0ubuntu1.26
openssl 3.0.2-0ubuntu1.26

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8625-1
https://launchpad.net/bugs/2161371

Package Information:
https://launchpad.net/ubuntu/+source/openssl/3.5.5-1ubuntu3.3
https://launchpad.net/ubuntu/+source/openssl/3.0.13-0ubuntu3.12
https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.26

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