CVE-2026-44328

{"id": "CVE-2026-44328", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.2, "exploitabilityScore": 3.9}]}, "published": "2026-05-27T17:16:38.347", "references": [{"url": "https://github.com/free5gc/free5gc/issues/905", "tags": ["Exploit", "Issue Tracking"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/smf/pull/199", "tags": ["Issue Tracking", "Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/free5gc/issues/905", "tags": ["Exploit", "Issue Tracking"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}, {"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-306"}, {"lang": "en", "value": "CWE-476"}, {"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-05-28T16:24:05.127", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EF7EBB95-EB4E-44C5-BF0A-9C99B0A7775F", "versionEndExcluding": "4.2.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}