🛡️ CVE-2026-33540
🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-918 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-918
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-06
Updated 2026-06-02
Modified 2026-04-09
Fix URL N/A

Affected Packages

Software From version Fixed in
distribution — 3.1.0
github.com/distribution/distribution — —
github.com/distribution/distribution/v3 — —

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