CVE-2026-41726
In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
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.
- Record
CVE-2026-41726- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
EUVDEUVD-2026-35903
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.
- Record
EUVD-2026-35903- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-xvfq-4q6q-gxx7
In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
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.
- Record
GHSA-xvfq-4q6q-gxx7- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-41726- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
OSV
In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
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.
- Record
CVE-2026-41726- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
OSVGHSA-xvfq-4q6q-gxx7
In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
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.
- Record
GHSA-xvfq-4q6q-gxx7- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-770
- Updated
- 2026-11-02
OSVROOT-APP-MAVEN-CVE-2026-41726 No score
CVE-2026-41726 in io.root.org.springframework.kafka:spring-kafka - Patched by Root
Root has patched CVE-2026-41726 in the io.root.org.springframework.kafka:spring-kafka package for Root:Maven. Multiple fixed versions available.
- Record
ROOT-APP-MAVEN-CVE-2026-41726- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.springframework.kafka:spring-kafkaMaven |
4.0.0 to 4.0.5 | 4.0.6 |
org.springframework.kafka:spring-kafkaMaven |
3.3.0 to 3.3.15 | 3.3.16 |
org.springframework.kafka:spring-kafkaMaven |
3.2.0 to 3.2.13 | None known |
org.springframework.kafka:spring-kafkaMaven |
2.9.0 to 2.9.13 | None known |
org.springframework.kafka:spring-kafkaMaven |
through 2.8.11 | None known |
org.springframework.kafka:spring-kafkaMaven |
4.0.0 up to 4.0.6, plus listed versions 4.0.14.0.24.0.34.0.44.0.5 |
4.0.6 |
org.springframework.kafka:spring-kafkaMaven |
3.3.0 up to 3.3.16, plus listed versions 3.3.13.3.103.3.113.3.123.3.13 Show 10 moreShow less3.3.143.3.153.3.23.3.33.3.43.3.53.3.63.3.73.3.83.3.9 |
3.3.16 |
org.springframework.kafka:spring-kafkaMaven |
3.2.0 to 3.2.13, plus listed versions 3.2.13.2.103.2.23.2.33.2.4 Show 5 moreShow less3.2.53.2.63.2.73.2.83.2.9 |
None known |
org.springframework.kafka:spring-kafkaMaven |
2.9.0 to 2.9.13, plus listed versions 2.9.12.9.102.9.112.9.122.9.2 Show 7 moreShow less2.9.32.9.42.9.52.9.62.9.72.9.82.9.9 |
None known |
org.springframework.kafka:spring-kafkaMaven |
through 2.8.11, plus listed versions 1.0.0.RELEASE1.0.1.RELEASE1.0.2.RELEASE1.0.3.RELEASE1.0.4.RELEASE Show 45 moreShow less1.0.5.RELEASE1.0.6.RELEASE1.1.0.RELEASE1.1.1.RELEASE1.1.2.RELEASE1.1.3.RELEASE1.1.4.RELEASE1.1.5.RELEASE1.1.6.RELEASE1.1.7.RELEASE1.1.8.RELEASE1.2.0.RELEASE1.2.1.RELEASE1.2.2.RELEASE1.2.3.RELEASE1.3.0.RELEASE1.3.1.RELEASE1.3.10.RELEASE1.3.11.RELEASE1.3.2.RELEASE1.3.3.RELEASE1.3.4.RELEASE1.3.5.RELEASE1.3.6.RELEASE1.3.7.RELEASE1.3.8.RELEASE1.3.9.RELEASE2.0.0.RELEASE2.0.1.RELEASE2.0.2.RELEASE2.0.3.RELEASE2.0.4.RELEASE2.0.5.RELEASE2.0.6.RELEASE2.0.7.RELEASE2.0.8.RELEASE2.1.0.RELEASE2.1.1.RELEASE2.1.10.RELEASE2.1.11.RELEASE2.1.12.RELEASE2.1.13.RELEASE2.1.14.RELEASE2.1.2.RELEASE2.1.3.RELEASE |
None known |
io.root.org.springframework.kafka:spring-kafkaRoot:Maven |
before 3.3.14-root.io.1 | 3.3.14-root.io.13.2.4-root.io.1 |
org.springframework.kafka:spring-kafkaRoot:Maven |
before 3.3.14-aikido.1 | 3.3.14-aikido.13.2.4-aikido.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-41726 is a medium vulnerability (CVSS 6.5) in Spring For Apache Kafka, published June 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. Fixed in org.springframework.kafka:spring-kafka 4.0.6.
References
spring.io/security/cve-2026-41726
nvd.nist.gov/vuln/detail/CVE-2026-41726
github.com/spring-projects/spring-kafka/issues/4489
Left out here: 109 versions. The JSON record has them.