This advisory covers two security flaws in PHP 8.3 as packaged by Red Hat. The first is a heap-based buffer overflow in the array_merge() function (CVE-2025-14178), which could lead to memory corruption. The second is a denial of service vulnerability (CVE-2025-14180) caused by processing invalid character sequences in PDO PostgreSQL prepared statements. Both vulnerabilities are addressed in updated PHP 8.3 packages for Red Hat Enterprise Linux 9.6 Extended Update Support. The advisory references Red Hat Bugzilla entries 2425625 and 2425627 for the respective fixes. No CVSS scores are provided, but the severity is rated as high.

The heap-based buffer overflow could potentially allow an attacker to cause memory corruption, which might lead to application crashes or other unpredictable behavior. The denial of service vulnerability allows an attacker to disrupt PHP applications using PDO PostgreSQL by sending invalid character sequences, causing the application to become unresponsive. Both issues affect PHP 8.3 on Red Hat Enterprise Linux 9.6 Extended Update Support and related packages. There are no known exploits in the wild at this time.

Red Hat has released updated PHP 8.3 packages that fix these vulnerabilities. Users of affected Red Hat Enterprise Linux 9.6 Extended Update Support systems should apply the security update as detailed in the Red Hat advisory RHSA-2026:1190 and the referenced article https://access.redhat.com/articles/11258. Applying these official updates will remediate the vulnerabilities. No additional mitigation steps are indicated by the vendor advisory.