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Fencer Vulns
medium 6.5

CVE-2026-41726 json

In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header

published 2026-06-09 5 mo ago modified 2026-07-23 3 mo ago also GHSA-xvfq-4q6q-gxx7 , EUVD-2026-35903

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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.

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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-41726 updated cvss 6.5

spring-kafka: Spring-kafka: Denial of Service due to unbounded heap growth via unique header values

  • Red Hat Fuse 7 spring-kafka Red Hat JBoss Enterprise Application Platform Expansion Pack spring-kafka
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% 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-770 Allocation of Resources Without Limits or Throttling

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.