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CISCO Security Advisory

Published Date: Not specified

CVE: CVE-2026-109618

Advisory Summary

📅 October 22, 2026

🔷 Vulnerabilities in PHP Affecting Cisco Products — October 2026 (Critical)

⚠️ What’s happening
On Oct 21, the PHP Foundation released a Critical PHP security update that fixes two RCE vulnerabilities that are being widely referenced as “PHP2shell” within security communities.

• CVE-2026-109618 — RCE via OOM (Out-of-Memory) corruption
• CVE-2026-109619 — RCE via stale global state

• Remote Code Execution (RCE) under attacker-controlled conditions
• Potential post-exploitation persistence depending on the impacted component’s privilege model
• Rapid wormability potential if exploit chains are automated (typical for RCE-class issues)

🛡️ Market/ops action checklist (do this now)

• Any public-facing or internally reachable endpoints running PHP
• Any services that accept untrusted input that could influence memory/state conditions
• Tighten network access to management/web interfaces
• Add/strengthen WAF rules and input validation where applicable
• Monitor for indicators consistent with RCE attempts and abnormal process/module loading

• PHP Foundation advisories:
• GHSA-w8hw-w9fx-j79w
• GHSA-6wmf-4rv5-p3rp

-2026-109618 -2026-109619

Reference: Vendor Advisory