CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NCVE-2026-33540
High (7.5) in distribution project distribution. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in github.com/distribution/distribution/v3 3.1.0.
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.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-31)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Affected
- distribution_project:distribution
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3p65-76g6-3w7r | Go | github.com/distribution/distribution/v3 | <3.1.0 | 3.1.0 |
| GHSA-3p65-76g6-3w7r | Go | github.com/distribution/distribution | <=2.8.3 | no fix published |
| GO-2026-5094 | Go | github.com/distribution/distribution | all versions | no fix published |
| GO-2026-5094 | Go | github.com/distribution/distribution/v3 | <3.1.0 | 3.1.0 |