What’s Vulnerable › Vulnerabilities

CVE-2025-23208: IdP group membership revocation ignored in zot

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-01-17 · updated 2026-06-17
• Weakness: CWE-269

Description

zot is a production-ready vendor-neutral OCI image registry. The group data stored for users in the boltdb database (meta.db) is an append-list so group revocations/removals are ignored in the API. SetUserGroups is alled on login, but instead of replacing the group memberships, they are appended. This may be due to some conflict with the group definitions in the config file, but that wasn't obvious to me if it were the case. Any Zot configuration that relies on group-based authorization will not respect group remove/revocation by an IdP. This issue has been addressed in version 2.1.2. All users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• project-zot zot: before 2.1.2 — fixed in 2.1.2

How to fix

Upgrade to a fixed version: project-zot zot 2.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/project-zot/zot/blob/5e30fec65c49e3139907e2819ccb39b2e3bd784e/pkg/meta/boltdb/boltdb.go#L1665
• https://github.com/project-zot/zot/commit/002ac62d8a15bf0cba010b3ba7bde86f9837b613
• https://github.com/project-zot/zot/security/advisories/GHSA-c9p4-xwr9-rfhx

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