{"id":"EUVD-2026-68016","revision":"39297777d6234cfc86eb1f18ef6868ff","records":[{"revision":"39297777d6234cfc86eb1f18ef6868ff","observedAt":"2026-10-30T09:57:21.362+00:00","statement":{"source":"euvd","id":"EUVD-2026-68016","aliases":["CVE-2026-55784","GHSA-334q-h5g3-fpxv"],"title":"free5GC is an open-source implementation of the 5G core network. In version 1.4.4 and earlier, the AUSF component stores per-subscriber authentication state in a global sync.Map named AUSFContext.UePool in internal/context/context.go, keyed…","description":"free5GC is an open-source implementation of the 5G core network. In version 1.4.4 and earlier, the AUSF component stores per-subscriber authentication state in a global sync.Map named AUSFContext.UePool in internal/context/context.go, keyed only by SUPI. Every request handled by internal/sbi/processor/ue_authentication.go creates an AusfUeContext, and AddAusfUeContextToPool executes ausfContext.UePool.Store(ausfUeContext.Supi, ausfUeContext), unconditionally replacing the active context for that SUPI. An attacker with access to the AUSF SBI/N12 interface can send concurrent POST /nausf-auth/v1/ue-authentications requests for the same target SUPI, causing all attempts to share one logical authentication context URL while K_aut, XRES, and EapID are repeatedly overwritten. A valid EAP-AKA' response for an earlier challenge is then checked against the latest context, causing AT_MAC verification to fail and denying authentication to the selected subscriber while the request flood continues. No fixed version is available as of this review.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/free5gc/free5gc/security/advisories/GHSA-334q-h5g3-fpxv"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-68016","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Aug 28, 2026, 10:23:41 PM","dateUpdated":"Sep 1, 2026, 2:04:02 AM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-68016","identifiers":["EUVD-2026-68016","CVE-2026-55784","GHSA-334q-h5g3-fpxv"]},"retained":false,"historicalAffected":[]}],"coverage":[]}