What is CVE-2026-33540?

CVE-2026-33540 is a high-severity vulnerability in Distribution, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2026-04-06.

How severe is CVE-2026-33540?

High severity. CVSS v3 base score is 7.5 out of 10.

SSRF in Distribution

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 challenges returned by the configured upstre…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.001 (17.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Distribution — versions < 3.1.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

https://github.com/distribution/distribution/security/advisories/GHSA-3p65-76g6-3w7r (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33540?: CVE-2026-33540 is a high-severity vulnerability in Distribution, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.5/10. Published 2026-04-06.
How severe is CVE-2026-33540?: High severity. CVSS v3 base score is 7.5 out of 10.