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[USN-8861-1] OpenSSL vulnerabilities

Posted on 01 October 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8861-1
October 01, 2026

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

- Ubuntu 26.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

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

Details:

It was discovered that OpenSSL had an inefficient algorithm in its QUIC
stream reassembly implementation. A remote attacker could possibly use this
issue to cause OpenSSL to use excessive CPU resources, leading to a denial
of service. (CVE-2026-42772)

It was discovered that OpenSSL did not properly limit memory allocated for
QUIC packet buffers. A remote attacker could possibly use this issue to
cause OpenSSL to use excessive memory resources, leading to a denial of
service. (CVE-2026-54873)

Update instructions:

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

Ubuntu 26.04 LTS
libssl3t64 3.5.5-1ubuntu3.7

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

References:
https://ubuntu.com/security/notices/USN-8861-1
CVE-2026-42772, CVE-2026-54873

Package Information:
https://launchpad.net/ubuntu/+source/openssl/3.5.5-1ubuntu3.7

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