What’s Vulnerable › Vulnerabilities

CVE-2026-40965

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-22
• Weakness: CWE-200

Description

Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a vulnerability where EC (Elliptic Curve) private keys are inadvertently exposed through the public /token_keys endpoint. This endpoint is designed to provide public key material for JWT token verification but incorrectly exposes private key components for EC keys. The vulnerability affects deployments using EC keys for JWT token signing. The vulnerability does not affect RSA key configurations, only deployments using EC keys for JWT signing. Affected versions: - uaa_release: v76.12.0 through v78.12.0 (inclusive); fixed in v78.13.0 or later - CF Deployment: v30.0.0 through v56.0.0 (inclusive); fixed in v56.1.0 or later (bundles uaa_release v78.13.0)

Affected products

• Cloud Foundry Foundation CF Deployment: from 30.0.0 before 56.1.0 — fixed in 56.1.0
• Cloud Foundry Foundation uaa_release: from 76.12.0 before 78.13.0 — fixed in 78.13.0

How to fix

Upgrade to a fixed version: Cloud Foundry Foundation CF Deployment 56.1.0; Cloud Foundry Foundation uaa_release 78.13.0. Check the vendor advisory for mitigations.

References

• https://www.cloudfoundry.org/blog/cve-2026-40965-uaa-ec-private-key-disclosure/

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