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Medium severity · published Jun 9, 2026
CVE-2026-41727
In Spring for Apache Kafka, forged retry topic headers subvert retry routing and backoff behavior
6.5
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SF
Spring for Apache Kafka · Spring
4.0.0 before 4.0.5.1; 3.3.0 before 3.3.15.1; 3.2.0 before 3.2.14; 2.9.0 before 2.9.14; 2.8.0 before 2.8.12 · source: vendor, NVD
Affected product
SF
Spring for Apache Kafka
Spring
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41727
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41727
Vendor Advisory
https://spring.io/security/cve-2026-41727
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