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

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-26 · updated 2026-09-02
Weakness: CWE-918

Description

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. Spring Integration 7.1.0 Spring Integration 7.0.0 - 7.0.5 Spring Integration 6.5.0 - 6.5.10 Spring Integration 6.4.0 - 6.4.12 Spring Integration 5.5.21 and earlier

Affected products

Spring Integration: before 5.5.22; from 6.4.0 before 6.4.13; from 6.5.0 before 6.5.11; from 7.0.0 before 7.0.5.1; from 7.1.0 before 7.1.0.1 — fixed in 5.5.22, 6.4.13, 6.5.11, 7.0.5.1, 7.1.0.1
Spring Integration: from 7.0.0 through 7.0.5; from 6.5.0 through 6.5.10; from 6.4.0 through 6.4.12; through 5.5.21; 7.1.0

How to fix

Upgrade to a fixed version: Spring Integration 5.5.22, 6.4.13, 6.5.11, 7.0.5.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-47861

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