CVE-2026-33540: Distribution affected by pull-through cache credential exfiltration via www-authenticate bearer realm

CVE-2026-33540 · Severity: low · CVSS 3.1 · Published 2026-06-25

Distribution affected by pull-through cache credential exfiltration via www-authenticate bearer realm in github.com/distribution/distribution

Technologies: github.com/distribution/distribution (Go), github.com/distribution/distribution/v3 (Go). Vendors: Go.

Quick answers

Is CVE-2026-33540 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33540 being exploited in the wild.
How severe is CVE-2026-33540?
Low severity, with a CVSS score of 3.1, published 25 June 2026.
Which products and versions are affected?
github.com/distribution/distribution (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=2.8.3; github.com/distribution/distribution/v3 (Go) SEMVER:introduced=0,fixed=3.1.0.
Is there a fix for CVE-2026-33540?
Yes. github.com/distribution/distribution/v3 (Go): upgrade to 3.1.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33540?
Check whether you run github.com/distribution/distribution (Go) or github.com/distribution/distribution/v3 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/distribution/distribution/v3 (Go): upgrade to 3.1.0 or later
    go get github.com/distribution/distribution/v3@v3.1.0

Affected products

  • github.com/distribution/distribution (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=2.8.3
  • github.com/distribution/distribution/v3 (Go) SEMVER:introduced=0,fixed=3.1.0

Identifiers

  • CVE-2026-33540
  • GHSA-3p65-76g6-3w7r
  • GO-2026-5094

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