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Two Critical PHP Core Flaws Allow Unauthenticated Remote Code Execution, Patches Released

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Two PHP core runtime vulnerables, CVE-2026-109618 and CVE-2026-109619, were disclosed on October 21, 2026, each scored 9.2 out of 10 under CVSS v4.0. They can let an unauthenticated attacker run arbitrary code on a server through a crafted HTTP request. The flaws affect PHP versions 5.4 through 8.5.11, and fixes are available in PHP 8.5.12, 8.4.27, 8.3.36, and 8.2.35. PHP 8.1 and earlier are end-of-life and will not receive patches, so administrators are advised to update the runtime, rebuild containers, and isolate unpatched public-facing systems.

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