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Fencer Vulns
medium 6.5

CVE-2026-41727 json

In Spring for Apache Kafka, forged retry topic headers subvert retry routing and backoff behavior

published 2026-06-09 5 mo ago modified 2026-08-12 2 mo ago also GHSA-53w6-v7cv-fc9h , EUVD-2026-35904

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven org.springframework.kafka:spring-kafka 3.3.16, 4.0.6
  • Spring Spring for Apache Kafka 2.8.12, 2.9.14, 3.2.14, 3.3.15.1, 4.0.5.1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.springframework.kafka:spring-kafka
>=4.0.0, <4.0.6
>=3.3.0, <3.3.16
>=3.2.0, <=3.2.13
>=2.9.0, <=2.9.13
<=2.8.11
4.0.6
3.3.16

Affected products

  • Spring Spring for Apache Kafka

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.