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[USN-8743-1] PHP vulnerabilities

Posted on 10 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8743-1
September 10, 2026

php8.1, php8.3, php8.5 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

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

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 backslash escaping in the
PostgreSQL extension. An attacker could use this issue to perform SQL
injection attacks. (CVE-2026-17543)

It was discovered that PHP incorrectly handled certain inputs to the
bccomp() function. An attacker could use this issue to cause an out-of-
bounds write, resulting in a denial of service or possibly execute
arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-17544)

It was discovered that PHP incorrectly handled circular symbolic links in
phar archives. An attacker could use this issue to cause unbounded
recursion, resulting in a denial of service. (CVE-2026-7260)

Update instructions:

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

Ubuntu 26.04 LTS
libapache2-mod-php8.5 8.5.4-0ubuntu1.3
php8.5-cgi 8.5.4-0ubuntu1.3
php8.5-cli 8.5.4-0ubuntu1.3
php8.5-fpm 8.5.4-0ubuntu1.3

Ubuntu 24.04 LTS
libapache2-mod-php8.3 8.3.6-0ubuntu0.24.04.11
php8.3-cgi 8.3.6-0ubuntu0.24.04.11
php8.3-cli 8.3.6-0ubuntu0.24.04.11
php8.3-fpm 8.3.6-0ubuntu0.24.04.11

Ubuntu 22.04 LTS
libapache2-mod-php8.1 8.1.2-1ubuntu2.26
libphp8.1-embed 8.1.2-1ubuntu2.26
php8.1-cgi 8.1.2-1ubuntu2.26
php8.1-cli 8.1.2-1ubuntu2.26
php8.1-fpm 8.1.2-1ubuntu2.26

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

References:
https://ubuntu.com/security/notices/USN-8743-1
CVE-2026-17543, CVE-2026-17544, CVE-2026-7260

Package Information:
https://launchpad.net/ubuntu/+source/php8.5/8.5.4-0ubuntu1.3
https://launchpad.net/ubuntu/+source/php8.3/8.3.6-0ubuntu0.24.04.11
https://launchpad.net/ubuntu/+source/php8.1/8.1.2-1ubuntu2.26

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