PHP Patches Two Critical Unauthenticated RCEs (CVE-2026-109618, CVE-2026-109619): [Updated for CVE-2026-115560]
On Wednesday, October 21, 2026 at 14:00 UTC, the PHP project released PHP 8.5.12, 8.4.27, 8.3.36, and 8.2.35 to fix two critical vulnerabilities, both rated CVSS v4.0 9.2, that can allow unauthenticated remote code execution. The PHP security team advises: "There are no complete mitigations; updating is the only safe choice." These are bugs in the PHP runtime, not in a Composer package.