Insufficient Validation of User-Supplied Headers in PHP

CVE-2025-1736

What is CVE-2025-1736?

A vulnerability has been identified in PHP versions prior to their specified updates, concerning the handling of user-supplied headers. This issue stems from inadequate validation of end-of-line characters which can lead to two significant problems: either preventing certain headers from being processed or causing misinterpretation of header data. This flaw could potentially disrupt the expected behavior of applications relying on proper header handling, thereby posing risks to application integrity and user security.

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