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

Source: https://junglewise.ai/threats/cve-2026-33540-distribution-affected-by-pull-through-cache-credential  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/github-com-distribution-distribution), [github.com/distribution/distribution/v3 (Go)](https://junglewise.ai/threats/technologies/github-com-distribution-distribution-v3). Vendors: [Go](https://junglewise.ai/threats/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

  ```sh
  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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