medium4.9
CVE-2026-59396
A denial-of-service vulnerability exists in UAA's private_key_jwt client-authentication mechanism...
Impact
A denial-of-service vulnerability exists in UAA's private_key_jwt client-authentication mechanism. When UAA retrieves a remote JWKS URI, it caches the response. Invalid authentication attempts can trigger full deserialization of this cached data. An attacker with prerequisites (write access to clients or a compromised endpoint) can send anonymous requests that force repeated parsing of large cached objects, causing excessive CPU usage and potential Java heap exhaustion via OutOfMemoryError, resulting in service unavailability.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cloudfoundry Foundation | UAA | from 76.23.0 before 79.9.0 |
| Cloud Foundry | Cf-Deployment | before 60.11.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-xf4x-4c6x-9xm2
- https://nvd.nist.gov/vuln/detail/CVE-2026-59396
- https://www.cloudfoundry.org/blog/cve-2026-59396-dos-vulnerability-in-uaa-related-to-jwks-uri-handling-2
- https://www.cloudfoundry.org/blog/cve-2026-59396-dos-vulnerability-in-uaa-related-to-jwks-uri-handling-2/