PHP says new session-related RCE CVE-2026-115560 needs an unusual config and is handled in regular release
A widely shared alert called CVE-2026-115560 an urgent, unpatched PHP remote code execution flaw, but the official php.net advisory describes it as informational. It is reachable only when an application sets the session serialize handler at runtime alongside upload progress enabled, a combination PHP calls unlikely in practice. PHP recommends disabling session.upload_progress, which was already the mitigation from the earlier Tuesday advisory, and says users who applied it need no further action. The full advisory will be published with the next regular bugfix release. Administrators are advised to check whether their applications change the serialize handler at runtime.
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