CVE-2026-33551: An issue was discovered in OpenStack Keystone 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0

Routine

LOW 3.5UPGRADE

CVE-2026-33551 is a low-severity flaw (CVSS 3.5) 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 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. Restricted application credentials can create EC2 credentials. By using a restricted application credential to call the EC2 credential creation API, an authenticated user with only a reader role may obtain an EC2/S3 credential that carries the full set of the parent user's S3 permissions, effectively bypassing the role restrictions imposed on th

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-04-10
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: openstack

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

Am I affected?

Timeline

2026-04-10 03:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

openstack keystone UPGRADE

Affected: >= 14.0.0 and < 26.1.1 · 27.0.0 · 28.0.0 · 29.0.0

Fixed in: 26.1.1

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 26.1.1 (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-2026-33551?

keystone: upgrade to 26.1.1. Exact commands for each OS are on this page.

Is CVE-2026-33551 being exploited?

CVE-2026-33551 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-2026-33551 affect?

CVE-2026-33551 affects keystone. Severity is low (CVSS 3.5). An issue was discovered in OpenStack Keystone 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. Restricted application credentials can create EC2 credentials. By using a restricted application credential to call the EC2 credential cr

How urgent is CVE-2026-33551?

Priority 20/100. Public exploit reference

Software pages

OpenStack vulnerabilities

Related CVEs

CVE-2026-43001 HIGH 7.9 UPGRADE An issue was discovered in OpenStack Keystone before 29.0.2
CVE-2026-42998 MEDIUM 6.0 UPGRADE An issue was discovered in OpenStack Keystone before 29.0.2
CVE-2026-42999 MEDIUM 6.0 UPGRADE An issue was discovered in OpenStack Keystone before 29.0.2
CVE-2026-43000 MEDIUM 6.0 UPGRADE An issue was discovered in OpenStack Keystone before 29.0.2
CVE-2026-44394 MEDIUM 6.0 UPGRADE An issue was discovered in OpenStack Keystone before 29.0.2

References

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