{"cve":"CVE-2026-44328","nvd":{"published":"2026-05-27T17:16:38.347","modified":"2026-10-14T20:10:00.190","status":"Analyzed","description":"free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. On top of that, the DELETE /upi/v1/upNodesLinks/{upNodeRef} handler unconditionally dereferences upNode.UPF after the type-guarded async release, even though AN-typed nodes are constructed without a UPF object. As a result, a single unauthenticated DELETE /upi/v1/upNodesLinks/gNB1 request crashes the handler with a nil-pointer panic AND mutates the in-memory user-plane topology before panicking (the UpNodeDelete(upNodeRef) line runs first). This is an unauthenticated, state-mutating panic-DoS sink that an off-path network attacker can trigger by name against any AN entry. This vulnerability is fixed in 4.2.2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","score":8.2},"cwes":["CWE-306","CWE-476","CWE-862"],"references":["https://github.com/free5gc/free5gc/issues/905","https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr","https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb","https://github.com/free5gc/smf/pull/199","https://github.com/free5gc/free5gc/issues/905"],"products":["free5gc:free5gc"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-44328","score":0.00324,"percentile":0.25163,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-p9mg-74mg-cwwr","url":"https://osv.dev/vulnerability/GHSA-p9mg-74mg-cwwr","summary":"free5GC's SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating","modified":"2026-06-25T23:11:38.695637745Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/smf","purl":"pkg:golang/github.com/free5gc/smf","ranges":["<1.4.3"],"fixed":["1.4.3"]}]},{"id":"GO-2026-5537","url":"https://osv.dev/vulnerability/GO-2026-5537","summary":"free5GC's SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating in github.com/free5gc/smf","modified":"2026-06-25T23:01:19.725013035Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/smf","purl":"pkg:golang/github.com/free5gc/smf","ranges":["<1.4.3"],"fixed":["1.4.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}