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Ubuntu 26.04 PHP Significant Denial of Service Flaws USN-8564-1

ubuntu
Calendar Grey July 20, 2026
Scroller Ubuntu
Several PHP security issues fixed in Ubuntu 22.04, 24.04, 26.04 LTS, addressing denial of service concerns.
Several security issues were fixed in PHP.

Summary

Several security issues were fixed in PHP.

Software Description:

- php8.5: HTML-embedded scripting language interpreter

- php8.3: HTML-embedded scripting language interpreter

- php8.1: HTML-embedded scripting language interpreter

Details:

It was discovered that PHP incorrectly handled certain TLS setup failures,

resulting in a NULL pointer dereference. An attacker could possibly use

this issue to cause PHP to crash, resulting in a denial of service. This

issue only affected Ubuntu 26.04 LTS. (CVE-2026-12184)

It was discovered that PHP contained a buffer allocation flaw in the

OpenSSL extension when using the AES-WRAP-PAD algorithm. An attacker could

use this issue to cause PHP to crash, resulting in a denial of service, or

possibly execute arbitrary code. (CVE-2026-14355)

Topics%20covered

Topics Covered

security advisory denial of service security update php Ubuntu important

Update Instructions

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

Ubuntu 26.04 LTS
  php8.5                          8.5.4-0ubuntu1.2

Ubuntu 24.04 LTS
  php8.3                          8.3.6-0ubuntu0.24.04.10

Ubuntu 22.04 LTS
  php8.1                          8.1.2-1ubuntu2.25

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

References

https://ubuntu.com/security/notices/USN-8564-1

CVE-2026-12184, CVE-2026-14355

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8564-1

Topics%20covered

Topics Covered

security advisory denial of service security update php Ubuntu important

Package Information

https://launchpad.net/ubuntu/+source/php8.5/8.5.4-0ubuntu1.2
https://launchpad.net/ubuntu/+source/php8.3/8.3.6-0ubuntu0.24.04.10
https://launchpad.net/ubuntu/+source/php8.1/8.1.2-1ubuntu2.25

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