PHP web runtimes (CVE-2026-109618 and CVE-2026-109619)

Bulletin ID: 2026-143-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/21/2026 14:30 PM PDT

Two critical issues have been identified in PHP web runtimes (CVE-2026-109618 and CVE-2026-109619) that can allow an unauthenticated actor to run code on affected systems. A remote caller can send crafted web requests to affected PHP workers and execute arbitrary code, read process-accessible data, or cause denial of service.

AWS services are not impacted by these issues. Customers using the affected versions of PHP within the services listed below could be impacted and should review the guidance provided.

This issue is accessible remotely by an actor without authentication over the internet-to-customer-application boundary, which can result in code execution, unintended access to process-accessible data, or denial of service on the targeted PHP worker. The issue is bounded to the affected worker and its application-level permissions; no cross-customer propagation has been established to date.

Bulletin ID: 2026-143-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/21/2026 14:30 PM PDT

Two critical issues have been identified in PHP web runtimes (CVE-2026-109618 and CVE-2026-109619) that can allow an unauthenticated actor to run code on affected systems. A remote caller can send crafted web requests to affected PHP workers and execute arbitrary code, read process-accessible data, or cause denial of service.

AWS services are not impacted by these issues. Customers using the affected versions of PHP within the services listed below could be impacted and should review the guidance provided.

This issue is accessible remotely by an actor without authentication over the internet-to-customer-application boundary, which can result in code execution, unintended access to process-accessible data, or denial of service on the targeted PHP worker. The issue is bounded to the affected worker and its application-level permissions; no cross-customer propagation has been established to date.

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{ "Name": "PHP2Shell", "Priority": 0, "Statement": { "AndStatement": { "Statements": [ { "ByteMatchStatement": { "SearchString": "POST", "FieldToMatch": { "Method": {} }, "TextTransformations": [ { "Priority": 0, "Type": "NONE" } ], "PositionalConstraint": "EXACTLY" } }, { "OrStatement": { "Statements": [ { "ByteMatchStatement": { "SearchString": "PHPSESSID", "FieldToMatch": { "Cookies": { "MatchPattern": { "All": {} }, "MatchScope": "KEY", "OversizeHandling": "CONTINUE" } }, "TextTransformations": [ { "Priority": 0, "Type": "NONE" } ], "PositionalConstraint": "EXACTLY" } }, { "ByteMatchStatement": { "SearchString": "PHPSESSID", "FieldToMatch": { "Body": { "OversizeHandling": "CONTINUE" } }, "TextTransformations": [ { "Priority": 0, "Type": "NONE" } ], "PositionalConstraint": "CONTAINS" } } ] } }, { "ByteMatchStatement": { "SearchString": "PHP_SESSION_UPLOAD_PROGRESS", "FieldToMatch": { "Body": { "OversizeHandling": "CONTINUE" } }, "TextTransformations": [ { "Priority": 0, "Type": "NONE" } ], "PositionalConstraint": "CONTAINS" } } ] } }, "Action": { "Block": {} }, "VisibilityConfig": { "SampledRequestsEnabled": true, "CloudWatchMetricsEnabled": true, "MetricName": "PHP2Shell" } }

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Please email aws-security@amazon.com with any security questions or concerns.

Please email aws-security@amazon.com with any security questions or concerns.