{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-33540","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-03-20T18:05:11.831Z","datePublished":"2026-04-06T14:55:04.812Z","dateUpdated":"2026-04-06T15:04:50.154Z"},"containers":{"cna":{"title":"Distribution affected by pull-through cache credential exfiltration via www-authenticate bearer realm","problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/distribution/distribution/security/advisories/GHSA-3p65-76g6-3w7r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/distribution/distribution/security/advisories/GHSA-3p65-76g6-3w7r"}],"affected":[{"vendor":"distribution","product":"distribution","versions":[{"version":"< 3.1.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-06T14:55:04.812Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-3p65-76g6-3w7r","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/distribution/distribution/security/advisories/GHSA-3p65-76g6-3w7r","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-06T15:04:46.763761Z","id":"CVE-2026-33540","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-06T15:04:50.154Z"}}]}}