NULL pointer dereference in Free5gc
CVE-2026-44322
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF PATCH /3gpp-pfd-management/v1/{afId}/transactions/{transId}/applications/{appId} handler panics with a nil-pointer dereference when the upstream UDR call fails AND the consumer wrapper returns err != nil together with a nil *ProblemDetails. The handler's errPfdData != nil branch builds its own problemDetailsErr correctly, but immediately after it reads problemDetails.Cause (the OTHER value, which is nil in this branch) and panics. Gin recovery converts the panic into HTTP 500, so a single PATCH against this endpoint returns 500 instead of the intended controlled error response whenever UDR access is failing. This vulnerability is fixed in 4.2.2.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (49.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Free5gc — versions < 4.2.2
Weakness classification (CWE)
References
- github.com/free5gc/free5gc/security/advisories/GHSA-j59f-x285-69jx (Exploit, Vendor Advisory)
- github.com/free5gc/free5gc/issues/925 (Exploit, Issue Tracking)
- github.com/free5gc/nef/pull/22 (Patch, Issue Tracking)
- github.com/free5gc/nef/commit/72a47f3fab4dffbd227f8d92c5f69dca93b610cb (Patch)
Frequently asked questions
- What is CVE-2026-44322?
- CVE-2026-44322 is a high-severity vulnerability in Free5gc, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-05-27.
- How severe is CVE-2026-44322?
- High severity. CVSS v3 base score is 7.5 out of 10.