## cve-2026-47861 - MEDIUM - UDP adapter sends ack to attacker-supplied host:port parsed from packet body, even when acknowledge=false

- 種別: advisory
- 関連技術: spring, java
- CVE: CVE-2026-47861
- 公開日時: 2026-08-20T00:00:00.000Z
- 情報源: Spring Security Advisories (https://spring.io/security/cve-2026-47861)
- パーマリンク: https://vulnpulse.app/items/spring-security-80e8c570470b

An unauthenticated remote attacker who can send a single UDP packet to a Spring Integration UDP inbound adapter can cause the server to emit an outbound UDP datagram to an arbitrary internal or external host and port of the attacker's choosing. This enables blind UDP SSRF (port scanning of internal networks via ICMP/behavior timing, triggering UDP services such as memcached/SNMP/NTP on internal hosts, or using the server as a reflection hop). The attacker controls both host and port; the payload is a 36-byte UUID string.