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Ubuntu 20.04 LTS OpenSSL High Heap Overflow and DoS Advisory USN-8414-2

ubuntu
Calendar Grey June 9, 2026
Scroller Ubuntu
Multiple vulnerabilities in OpenSSL affecting Ubuntu versions 14.04 to 20.04. Update recommended for security.
USN-8414-1 fixed several vulnerabilities in OpenSSL.

Summary

USN-8414-1 fixed several vulnerabilities in OpenSSL.

Software Description:

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

- openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools

Details:

USN-8414-1 fixed several vulnerabilities in OpenSSL. This update provides

the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu

18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory details:

Frank Buss discovered that OpenSSL had a heap buffer over-read in ASN.1

content parsing. An attacker could possibly use this issue to cause OpenSSL

to crash, resulting in a denial of service, or obtain sensitive

information. (CVE-2026-34180)

Asim Viladi Oglu Manizada and Alex Gaynor discovered that OpenSSL could

accept forged CMS AuthEnvelopedData messages. An attacker could possibly

use this issue to bypass message authentication checks. (CVE-2026-34182)

Mayank Jangid, Kushal Khemka, Hari Priandana, Bhabani Sankar Das, and Qifan

Zhang discovered that...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu OpenSSL heap overflow

Update Instructions

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

Ubuntu 20.04 LTS
  openssl                         1.1.1f-1ubuntu2.24+esm4
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  openssl                         1.1.1-1ubuntu2.1~18.04.23+esm9
                                  Available with Ubuntu Pro
  openssl1.0                      1.0.2n-1ubuntu5.13+esm5
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  openssl                         1.0.2g-1ubuntu4.20+esm16
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  openssl                         1.0.1f-1ubuntu2.27+esm14
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8414-2

https://ubuntu.com/security/notices/USN-8414-1

CVE-2026-34180, CVE-2026-34182, CVE-2026-42766, CVE-2026-45447,

CVE-2026-7383, CVE-2026-9076

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8414-2

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu OpenSSL heap overflow

Package Information

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