{"id":"CVE-2026-41727","aliases":["GHSA-53w6-v7cv-fc9h"],"url":"https://o3.security/vulnerability/CVE-2026-41727","summary":"In Spring for Apache Kafka, forged retry topic headers subvert retry routing and backoff behavior","details":"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.\n\nAffected versions:\nSpring 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.","published":"2026-06-09T23:49:10.215Z","modified":"2026-08-12T18:11:02.516814714Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Maven","name":"org.springframework.kafka:spring-kafka","fixedVersion":"4.0.6"},{"ecosystem":"Maven","name":"org.springframework.kafka:spring-kafka","fixedVersion":"3.3.16"},{"ecosystem":"Maven","name":"org.springframework.kafka:spring-kafka","fixedVersion":null},{"ecosystem":"Maven","name":"org.springframework.kafka:spring-kafka","fixedVersion":null},{"ecosystem":"Maven","name":"org.springframework.kafka:spring-kafka","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://spring.io/security/cve-2026-41727"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41727.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41727"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T18:11:02.516814714Z"}}