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VulnerabilityPublished Updated

CVE-2026-41726: Spring for Apache Kafka · Unthrottled Resource Allocation

Affects Spring for Apache KafkaSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium · fixed in 4.0.5.1 : update Spring for Apache Kafka when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 22% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.0.5.1, 3.3.15.1, 3.2.14 +2
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
SpringSpring for Apache KafkaAffected
  • >=4.0.0 <4.0.5.1
Fixed in
  • 4.0.5.1
SpringSpring for Apache KafkaAffected
  • >=3.3.0 <3.3.15.1
Fixed in
  • 3.3.15.1
SpringSpring for Apache KafkaAffected
  • >=3.2.0 <3.2.14
Fixed in
  • 3.2.14
SpringSpring for Apache KafkaAffected
  • >=2.9.0 <2.9.14
Fixed in
  • 2.9.14
SpringSpring for Apache KafkaAffected
  • >=2.8.0 <2.8.12
Fixed in
  • 2.8.12
Mavenorg.springframework.kafka/spring-kafkapkg:maven/org.springframework.kafka/spring-kafkaOther threatsAffected
  • 2.8.0 – 4.0.6
10 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, consider disabling or avoiding the use of DelegatingDeserializer if feasible, or implement application-level controls to limit or validate the spring.kafka.serialization.selector header values to prevent unbounded resource consumption.

Description

When an application opts into DelegatingDeserializer, a producer can grow the consumer's heap without bound by sending records with unique random spring.kafka.serialization.selector header values, eventually causing GC thrash and OutOfMemoryError. 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.

References

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