CVE-2026-17543

A flaw was found in PHP. Improper escaping of backslashes in attacker-provided parameters can lead to a SQL injection vulnerability. A remote attacker could exploit this flaw by crafting malicious input, potentially gaining unauthorized access to sensitive information, manipulating data, or causing a denial of service.

The Red Hat Product Security team has assessed the severity of this vulnerability as Important. A remote attacker could exploit this flaw to inject malicious SQL commands into a connected PostgreSQL database, potentially exposing or manipulating sensitive data. However, only applications using PHP's older pg_insert(), pg_update(), pg_select(), or pg_delete() functions with unsanitized user input are at risk applications built on modern practices such as PDO, prepared statements, or parameterized queries are not affected. The vulnerability stems from improper handling of backslash characters in PHP's PostgreSQL extension, which can allow an attacker to break out of expected query boundaries and execute unintended SQL commands.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.