CVE-2026-44321free5GC is an open-source implementation of the 5G core network.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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. The POST /upi/v1/upNodesLinks create-or-update handler accepts attacker-controlled JSON and passes it directly into UpNodesFromConfiguration(), which calls logger.InitLog.Fatalf(...) on several validation failures. One confirmed path is the UE-IP-pool overlap check: a single unauthenticated POST that adds a new UPF whose pool overlaps an existing UPF terminates the entire SMF process (docker ps shows Exited (1)), not just the goroutine. This vulnerability is fixed in 4.2.2.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-306, CWE-617, CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
free5gc free5gc free5gc:free5gc | before 4.2.2 | NVD |
References
- https://github.com/free5gc/free5gc/issues/906exploit, issue-tracking
- https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97exploit, vendor-advisory
- https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5patch
- https://github.com/free5gc/smf/pull/203issue-tracking, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.