VDB
DEBIAN-CVE-2026-33540
DEBIAN-CVE-2026-33540
PUBLISHED
CVSS 7.5 HIGH
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:14 | docker-registry | 2.8.3+ds1-2, 0 |
| Debian:12 | docker-registry | 2.8.2+ds1-1, 2.8.3+ds1-1, 0 |
| Debian:13 | docker-registry | 2.8.3+ds1-2, 0, 2.8.3+ds1-3 |
Timeline
- Apr 6, 2026 CVE Published
- Oct 1, 2026 CVE Updated