CVE-2026-40965 PUBLISHED

Assigner: vmware
Reserved: 16.04.2026 Published: 01.06.2026 Updated: 02.06.2026

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)

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
CVSS Score: 10

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	Low	Availability	Low
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
CVSS Score: 10

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	Cloud Foundry Foundation
Product	uaa_release
Versions	Default: unaffected affected from 76.12.0 to 78.13.0 (excl.)

Vendor	Cloud Foundry Foundation
Product	CF Deployment
Versions	Default: unaffected affected from 30.0.0 to 56.1.0 (excl.)

References

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

Problem Types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE

Impacts

An unauthenticated remote attacker can retrieve EC private key material from the public /token_keys endpoint, enabling full token forgery and complete compromise of confidentiality and integrity across all scoped systems (CVSS v3.1: C:H, I:H, A:L; scope: Changed).