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Ubuntu 25.10 OpenSSL Important DoS Issues USN-8155-1 CVE-2026-2673

ubuntu
Calendar Grey April 8, 2026
Dist Ubuntu Esm H88
Multiple security issues addressed in OpenSSL for latest Ubuntu releases. Immediate updates recommended to mitigate risks.
Several security issues were fixed in OpenSSL.

Summary

Several security issues were fixed in OpenSSL.

Software Description:

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

Details:

Viktor Dukhovni discovered that OpenSSL incorrectly negotiated the expected

preferred key exchange group when used as a TLS 1.3 server. This could

result in a less preferred key exchange being used, contrary to

expectations. This issue only affected Ubuntu 25.10. (CVE-2026-2673)

Igor Morgenstern discovered that OpenSSL incorrectly handled certain memory

operations when used as a DANE client. A remote attacker could use this

issue to cause OpenSSL to crash, resulting in a denial of service, or

possibly execute arbitrary code. (CVE-2026-28387)

Igor Morgenstern discovered that OpenSSL incorrectly handled certain memory

operations when processing a delta CRL. A remote attacker could possibly

use this issue to cause OpenSSL to crash, resulting in a denial of service.

(CVE-2026-28388)

Nathan Sportsman, Daniel Rhea, and Jaeho Nam discover...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu OpenSSL important CVE

Update Instructions

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

Ubuntu 25.10
  libssl3t64                      3.5.3-1ubuntu3.3
  openssl                         3.5.3-1ubuntu3.3

Ubuntu 24.04 LTS
  libssl3t64                      3.0.13-0ubuntu3.9
  openssl                         3.0.13-0ubuntu3.9

Ubuntu 22.04 LTS
  libssl3                         3.0.2-0ubuntu1.23
  openssl                         3.0.2-0ubuntu1.23

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

References

https://ubuntu.com/security/notices/USN-8155-1

CVE-2026-2673, CVE-2026-28387, CVE-2026-28388, CVE-2026-28389,

CVE-2026-28390, CVE-2026-31789, CVE-2026-31790

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8155-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu OpenSSL important CVE

Package Information

https://launchpad.net/ubuntu/+source/openssl/3.5.3-1ubuntu3.3
https://launchpad.net/ubuntu/+source/openssl/3.0.13-0ubuntu3.9
https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.23

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