CVEvulnerability

CVE-2026-33540

7.5 HIGH Published 2026-04-06 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-04-06
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-918

Description

Distribution is a toolkit to pack, ship, store, and deliver container content. Prior to 3.1.0, in pull-through cache mode, distribution discovers token auth endpoints by parsing WWW-Authenticate challenges returned by the configured upstream registry. The realm URL from a bearer challenge is used without validating that it matches the upstream registry host. As a result, an attacker-controlled upstream (or an attacker with MitM position to the upstream) can cause distribution to send the configured upstream credentials via basic auth to an attacker-controlled realm URL. This vulnerability is fixed in 3.1.0.

Affected configurations

• distribution project distribution (< 3.1.0)

Related

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References