{"id":"CVE-2026-44328","title":"free5GC is an open-source implementation of the 5G core network","summary":"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 u…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-306","CWE-476","CWE-862"],"vendor":"free5gc","product":"free5gc","affected":["free5gc < 4.2.2"],"patched":["free5gc 4.2.2"],"published":"2026-05-27","updated":"2026-10-14","sourceUpdated":"2026-10-14T20:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44328","references":[{"url":"https://github.com/free5gc/free5gc/issues/905","label":"security-advisories@github.com"},{"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr","label":"security-advisories@github.com"},{"url":"https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb","label":"security-advisories@github.com"},{"url":"https://github.com/free5gc/smf/pull/199","label":"security-advisories@github.com"},{"url":"https://github.com/free5gc/free5gc/issues/905","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00538,"epssPercentile":0.43959,"ingestedAt":"2026-10-14T20:53:12.332Z","slug":"CVE-2026-44328","body":"## Overview\n\nfree5GC 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.\n\n## Affected\n\n- `free5gc < 4.2.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `free5gc 4.2.2`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}