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DEBIAN-CVE-2026-33540

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-33540

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-33540

docker-registry

Source reference: /affected/0/package/name

Affected versions
2.8.2+ds1-1

Source reference: /affected/0/versions

2.8.3+ds1-1

Source reference: /affected/0/versions

2.8.3+ds1-2

Source reference: /affected/0/versions

2.8.3+ds1-3

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

docker-registry

Source reference: /affected/1/package/name

Affected versions
2.8.3+ds1-2

Source reference: /affected/1/versions

2.8.3+ds1-3

Source reference: /affected/1/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

docker-registry

Source reference: /affected/2/package/name

Affected versions
2.8.3+ds1-2

Source reference: /affected/2/versions

Fixed versions
2.8.3+ds1-3

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "docker-registry",
      "purl": "pkg:deb/debian/docker-registry?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.8.2+ds1-1",
      "2.8.3+ds1-1",
      "2.8.3+ds1-2",
      "2.8.3+ds1-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33540.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "docker-registry",
      "purl": "pkg:deb/debian/docker-registry?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.8.3+ds1-2",
      "2.8.3+ds1-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33540.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.8.3+ds1-3"
          }
        ]
      }
    ],
    "package": {
      "name": "docker-registry",
      "purl": "pkg:deb/debian/docker-registry?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.8.3+ds1-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33540.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56838 · Revision 1
Added to Heist Feed
Publisher date
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