Resource exhaustion in Fulcio - CVE-2025-66506
Published: December 16, 2025
Vulnerability identifier: #VU119999
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-66506
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources within the identity.extractIssuerURL() function when parsing untrusted arguments. A remote attacker can pass a specially crafted request with a malicious OIDC identity token to trigger resource exhaustion and perform a denial of service (DoS) attack.
Affected software
Fulcio
watsonx.data
watsonx.data integration
DataStage on Cloud Pak for Data
OpenShift Pipelines
AI Inference Server Model Optimization Tools
AI Inference Server
watsonx.data
watsonx.data integration
DataStage on Cloud Pak for Data
OpenShift Pipelines
AI Inference Server Model Optimization Tools
AI Inference Server
How to mitigate CVE-2025-66506
Install updates from vendor's website.
Fulcio - update to 1.8.3
watsonx.data - update to 2.3.1
watsonx.data integration - update to 5.3.1
DataStage on Cloud Pak for Data - update to 5.3.1
OpenShift Pipelines - update to 0.21.0
AI Inference Server Model Optimization Tools - update to 3.2.5
AI Inference Server - update to 3.2.5
watsonx.data - update to 2.3.1
watsonx.data integration - update to 5.3.1
DataStage on Cloud Pak for Data - update to 5.3.1
OpenShift Pipelines - update to 0.21.0
AI Inference Server Model Optimization Tools - update to 3.2.5
AI Inference Server - update to 3.2.5
External References
Related Security Bulletins
- Denial of service in Fulcio
- Multiple vulnerabilities in Red Hat AI Inference Server Model Optimization Tools
- Multiple vulnerabilities in Red Hat AI Inference Server (TPU)
- Multiple vulnerabilities in Red Hat AI Inference Server (CUDA)
- Multiple vulnerabilities in Red Hat AI Inference Server (ROCm)
- Multiple vulnerabilities in Red Hat AI Inference Server (ROCm)
- Red Hat OpenShift Pipelines update for Fulcio
- IBM watsonx.data update for Fulcio
- Multiple vulnerabilities in IBM watsonx.data integration
- Multiple vulnerabilities in IBM DataStage on Cloud Pak for Data