CVE catalog
CVE-2026-33540
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 chall
- Severity
- High · CVSS 7.5
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.27% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | docker-registry | sid | 2.8.3+ds1-3 | fixed |
| Debian | docker-registry | forky | 2.8.3+ds1-3 | fixed |
| Debian | docker-registry | trixie | 2.8.3+ds1-2 | vulnerable |
| Debian | docker-registry | bookworm | 2.8.2+ds1-1 | vulnerable |
| Cpe | docker-registry | Not reported | Not reported | vulnerable |
| Cpe | distribution | Not reported | 3.1.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | docker-registry | source | sid | 2.8.3+ds1-3 | not yet assigned | Not reported | [1134567] |
| Debian | docker-registry | source | forky | 2.8.3+ds1-3 | not yet assigned | Not reported | [1134567] |
| Debian | docker-registry | source | trixie | (unfixed) | not yet assigned | Not reported | [1134567] |
| Debian | docker-registry | source | bookworm | (unfixed) | not yet assigned | Not reported | [1134567] |
| Cpe | distribution | cpe | Not reported | 3.1.0 | Not reported | Not reported | Not reported |
Notes
[trixie] docker-registry: Minor issue [bookworm] docker-registry: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [docker-registry]Affected
Details (2)
2.8.2+ds1-1· amd64 · bookwormAffected
nvd · docker-registry · debian · bookworm; nvd · docker-registry · debian · 12
2.8.2+ds1-1· arm64 · bookwormAffected
nvd · docker-registry · debian · bookworm; nvd · docker-registry · debian · 12
- [golang-github-docker-distribution-dev]Affected
Source package: [docker-registry]
Details (2)
2.8.2+ds1-1· all · bookwormAffected
nvd · docker-registry · debian · bookworm; nvd · docker-registry · debian · 12
2.8.2+ds1-1· all · bookwormAffected
nvd · docker-registry · debian · bookworm; nvd · docker-registry · debian · 12
[Debian 13 (Trixie)]
- [docker-registry]Affected
Source package: [docker-registry]
Details (2)
2.8.3+ds1-2+b8· amd64 · trixieAffected
nvd · docker-registry · debian · 13
2.8.3+ds1-2+b8· arm64 · trixieAffected
nvd · docker-registry · debian · 13
- [golang-github-docker-distribution-dev]Affected
Source package: [docker-registry]
Details (2)
2.8.3+ds1-2· all · trixieAffected
nvd · docker-registry · debian · 13
2.8.3+ds1-2· all · trixieAffected
nvd · docker-registry · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_4212-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33540]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33540]
- [https://security-tracker.debian.org/tracker/CVE-2026-33540]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33540.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]