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Medium, CVSS 6.5

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

CVE-2026-41726GHSA-xvfq-4q6q-gxx7

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-xvfq-4q6q-gxx7 lists affected ranges: Maven org.springframework.kafka:spring-kafka >=4.0.0 =3.3.0 =3.2.0 =2.9.0 =0 <=2.8.11

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-41726: 0.30% estimated exploitation activity in the next 30 days; percentile 22.32 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-xvfq-4q6q-gxx7

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-41726

Advisory: In Spring for Apache Kafka, unbounded delegate cache keyed on user-controlled, potentially malicious selector header
IDs: CVE-2026-41726, GHSA-xvfq-4q6q-gxx7
Record: https://patchnext.com/advisories/cve-2026-41726 (revision 1, source checked 26 Oct 2026, 16:53 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: org.springframework.kafka:spring-kafka 4.0.6, 3.3.16. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.springframework.kafka:spring-kafka: affected >= 4.0.0, <= 4.0.5; >= 3.3.0, <= 3.3.15; >= 3.2.0, <= 3.2.13; >= 2.9.0, <= 2.9.13; <= 2.8.11; fixed in 4.0.6, 3.3.16

## Suggested inspection (read-only)
- Maven org.springframework.kafka:spring-kafka: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.springframework.kafka:spring-kafka.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-xvfq-4q6q-gxx7 (GitHub-reviewed advisory GHSA-xvfq-4q6q-gxx7 lists affected ranges: Maven org.springframework.kafka:spring-kafka >=4.0.0 =3.3.0 =3.2.0 =2.9.0 =0 <=2.8.11)

Commands are suggestions: review each one before running it.

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