In Spring for Apache Kafka, forged retry topic headers subvert retry routing and backoff behavior
CVE-2026-41727

6.5MEDIUM

Key Information:

Vendor

Spring

Status
Spring For Apache Kafka
Vendor
CVE Published:
9 June 2026

What is CVE-2026-41727?

Spring Kafka's retry topic infrastructure did not sufficiently validate user-controlled header values before acting on them. A producer could send a record with a crafted retry_topic-attempts header to supply an out-of-range attempt count and cause the retry topic router to misidentify where the message was in the retry sequence.

Affected versions: Spring for Apache Kafka 4.0.0 through 4.0.5; 3.3.0 through 3.3.15; 3.2.0 through 3.2.13; 2.9.0 through 2.9.13; 2.8.0 through 2.8.11.

Affected Version(s)

Spring for Apache Kafka 4.0.0 < 4.0.6

Spring for Apache Kafka 3.3.0 < 3.3.16

Spring for Apache Kafka 3.2.0 < 3.2.14

References

https://spring.io/security/cve-2026-41727

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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