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TI-2026-25933 Aliases CVE-2026-33540GHSA-3p65-76g6-3w7r

Distribution affected by pull-through cache credential exfiltration via www-authenticate bearer realm

Priority HIGH 72CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00285 21st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial distribution (distribution): 3.1.0github.com/distribution/distribution/v3 (Go): 3.1.0Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
distributiondistributionbefore 3.1.03.1.0Patch availableCNA
—github.com/distribution/distribution/v3 (Go)before 3.1.03.1.0Patch availableGHSA-3p65-76g6-3w7r
—github.com/distribution/distribution (Go)up to 2.8.3—No fix listedGHSA-3p65-76g6-3w7r
  • distribution Vendordistribution Affected before 3.1.0 Fixed in 3.1.0 Patch available CNA
  • github.com/distribution/distribution/v3 (Go) Vendor— Affected before 3.1.0 Fixed in 3.1.0 Patch available GHSA-3p65-76g6-3w7r
  • github.com/distribution/distribution (Go) Vendor— Affected up to 2.8.3 Fixed in — No fix listed GHSA-3p65-76g6-3w7r

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:distribution_project:distribution:*:*:*:*:*:go:*:*before 3.1.0VulnerableDistribution Project
  • cpe:2.3:a:distribution_project:distribution:*:*:*:*:*:go:*:* Versions before 3.1.0 Vulnerable ·Distribution Project

Remediation

  • Fix · CNA distribution (distribution) Fixed in 3.1.0
  • Fix · GHSA-3p65-76g6-3w7r github.com/distribution/distribution/v3 (Go) Fixed in 3.1.0 Advisory →

Red Hat 1 advisory

  • RHSA-2026:37387 Released 2026-07-09 · Red Hat rating Important
    Red Hat OpenShift Data Foundation 4.22.0 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.22 registry.redhat.io/odf4/cephcsi-rhel9, registry.redhat.io/odf4/cephcsi-rhel9-operator, registry.redhat.io/odf4/devicefinder-rhel9 +24

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat Openshift Data Foundation 4.22Fixed RHSA-2026:37387
Not affected: 1 product
  • Red Hat Openshift Data Foundation 4.22

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33540
  2. 2026-10-03 Alias added: GHSA-3p65-76g6-3w7r

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-27326 Distribution has stale blob access resurrection via repo-scoped redis descriptor cache invalidation CVSS 3.1HIGH 7.5
  • TI-2025-18656 Distribution's token authentication allows attacker to inject an untrusted signing key in a JWT CVSS 4.0MEDIUM 6.6
  • TI-2026-30291 Distribution: Tag deletion bypasses `storage.delete.enabled` configuration CVSS 4.0MEDIUM 6.3
  • TI-2026-71920 Distribution client does not verify manifest content against digest CVSS 3.1MEDIUM 6.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences