# CVE-2026-15567: Red Hat WildFly denial of service in CSIv2Util GSS token decoder

Source: https://junglewise.ai/threats/cve-2026-15567-red-hat-wildfly-denial-of-service-in-csiv2util-gss-token-decoder  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-11. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-15567 · Severity: high · CVSS 7.5 · Published 2026-08-11

WildFly is an open-source Java application server used to run enterprise applications. A remote attacker without credentials can send a specially crafted network request to trigger an out-of-memory condition, causing the server to crash and making applications unavailable. This can disrupt business operations and customer access to online services.

Technologies: [Red Hat WildFly](https://junglewise.ai/threats/technologies/wildfly). Vendors: [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-15567 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15567 being exploited in the wild.

**How severe is CVE-2026-15567?** High severity, with a CVSS score of 7.5, published 11 August 2026.

**Which products and versions are affected?** Red Hat WildFly <UNKNOWN>.

**Is there a fix for CVE-2026-15567?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-15567 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-15567?** Check whether you run Red Hat WildFly at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an unbounded memory allocation flaw in WildFly's CSIv2Util component, which handles GSS (Generic Security Service) token decoding for CORBA/CSI authentication. The vulnerable code reads an attacker-controlled length field from the incoming token without validating its bounds, then attempts to allocate a byte array of that size. An unauthenticated remote attacker can send a token with an extremely large length value to trigger an OutOfMemoryError, exhausting heap memory and crashing the server. The attack is network-reachable and requires no authentication or user interaction. A patch is expected from Red Hat.

## Affected products

- Red Hat WildFly <UNKNOWN>

## Timeline

- 2026-08-11: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/jbossnetwork/restricted/listSoftware.html](https://access.redhat.com/jbossnetwork/restricted/listSoftware.html)

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