Server-Side Request Forgery (SSRF) Affecting distribution-registry package, versions <3.1.0-160000.1.1


Severity

Recommended
medium

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.39% (31st percentile)

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  • Snyk IDSNYK-SLES1600-DISTRIBUTIONREGISTRY-16687338
  • published14 May 2026
  • disclosed6 May 2026

Introduced: 6 May 2026

CVE-2026-33540  (opens in a new tab)
CWE-918  (opens in a new tab)

How to fix?

Upgrade SLES:16.0.0 distribution-registry to version 3.1.0-160000.1.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream distribution-registry package and not the distribution-registry package as distributed by SLES. See How to fix? for SLES:16.0.0 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1