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

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HIGH 7.9UPGRADE

CVE-2026-43001 is a high-severity flaw (CVSS 7.9) affecting keystone. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score7.9 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededHigh
User interactionNone
EPSS exploit chance0.5% (top 60%)
CISA exploited listNo
WeaknessCWE-863, CWE-1288
Published2026-05-01
Last modified2026-10-26
Publisher (CNA): MITRE · Vendor: openstack

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Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

openstack keystone UPGRADE
Affected: >= 14.0.0 and < 27.0.2 · >= 28.0.0 and < 28.0.2 · >= 29.0.0 and < 29.0.2
Fixed in: 27.0.2, 28.0.2, 29.0.2
Safe to downgrade to: a release before 14.0.0
1. Check installed version
apt-cache policy keystone || rpm -q keystone || keystone --version
2. UPGRADE to 27.0.2 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade keystone
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade keystone
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 14.0.0 (Debian / Ubuntu)
apt-cache madison keystone sudo apt install keystone=<VERSION_BEFORE_14.0.0> sudo apt-mark hold keystone
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list keystone sudo dnf downgrade keystone-<VERSION_BEFORE_14.0.0> sudo dnf versionlock add keystone
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-43001?

keystone: upgrade to 27.0.2, 28.0.2, 29.0.2. Exact commands for each OS are on this page.

Is CVE-2026-43001 being exploited?

CVE-2026-43001 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43001 affect?

CVE-2026-43001 affects keystone. Severity is high (CVSS 7.9). 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

How urgent is CVE-2026-43001?

Priority 43/100. High severity; Public exploit reference

Software pages

OpenStack vulnerabilities

Related CVEs

References

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