CVE-2026-59320: In Spring AMQP the link credit never replenished on listener exception path

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-27 · updated 2026-08-31
Weakness: CWE-772

Description

When a container-level ErrorHandler is configured (the mitigation for finding 221000), each delivery whose processing throws still permanently consumes one link credit. After initialCredits (default 100) failing messages the receiver's credit reaches zero and the broker stops delivering, leaving the listener silently stalled while isRunning() remains true. Spring AMQP 4.1.0

Affected products

Spring AMQP: from 4.1.0 before 4.1.1 — fixed in 4.1.1
Spring AMQP: 4.1.0

How to fix

Upgrade to a fixed version: Spring AMQP 4.1.1. Check the vendor advisory for mitigations.

References

https://spring.io/security/cve-2026-59320

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