PHP2Shell: leaked critical PHP RCE zero-days (CVE-2026-109618/109619)
Details of two critical unauthenticated remote code execution flaws in the PHP interpreter (CVE-2026-109618, CVE-2026-109619; CVSS v4.0 9.2) leaked on 2026-10-20 before fixes existed, prompting early exploitation attempts and precautionary shutdowns of many PHP sites until PHP shipped 8.5.12, 8.4.27, 8.3.36 and 8.2.35 on 2026-10-21.
- Oct 21, 2026 · UTC
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Patchstack says its telemetry still shows only probing, with no hard evidence of breaches, and expects this to change once patch details are public. patchstack.com
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PHP releases 8.5.12, 8.4.27, 8.3.36 and 8.2.35 fixing both flaws, plus minimal source backports for 7.4, 8.0 and 8.1, ahead of the 14:00 UTC schedule. php.net
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Finland's state IT centre Valtori and several universities, including the University of Vienna, shut down public-facing services as a precaution. precursorsecurity.com