CVE-2026-31801
HIGH
GHSA-85jx-fm8m-x8c6
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Lifecycle Timeline
3Tags
Description
zot is ancontainer image/artifact registry based on the Open Container Initiative Distribution Specification. From 1.3.0 to 2.1.14, zot’s dist-spec authorization middleware infers the required action for PUT /v2/{name}/manifests/{reference} as create by default, and only switches to update when the tag already exists and reference != "latest". As a result, when latest already exists, a user who is allowed to create (but not allowed to update) can still pass the authorization check for an overwrite attempt of latest. This vulnerability is fixed in 2.1.15.
Analysis
Zot registry versions 1.3.0 through 2.1.14 have an authorization bypass in the manifest upload endpoint that allows authenticated users with only create permissions to overwrite the latest tag when it already exists. An attacker with limited write privileges can leverage this flaw to replace the latest image version, potentially distributing malicious container images to downstream consumers. …
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Remediation
Within 24 hours: Inventory all zot deployments and assess exposure; notify stakeholders and document affected systems. Within 7 days: Implement network segmentation to restrict zot access to authorized personnel only; enable enhanced logging and monitoring for suspicious registry activity; evaluate alternative registry solutions. …
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