CVE-2026-44328
8.2 HIGHfree5GC is an open-source implementation of the 5G core network
Published: 2026-05-27 · Last updated: 2026-05-28
Severity and scoring
- CVSS
- 8.2 HIGH
- Vector
- 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
Affected products
| Vendor | Product |
|---|---|
| free5gc | free5gc |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-44328
- [Exploit reference]https://github.com/free5gc/free5gc/issues/905
- [Vendor advisory]https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
- [Patch]https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb
- [Patch]https://github.com/free5gc/smf/pull/199
- [Exploit reference]https://github.com/free5gc/free5gc/issues/905
- [Vendor advisory]https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr
Related CVEs
Same vendor
- CVE-2026-44330 — free5GC is an open-source implementation of the 5G core network (10.0 CRITICAL)
- CVE-2026-44329 — free5GC is an open-source implementation of the 5G core network (10.0 CRITICAL)
- CVE-2026-44327 — free5GC is an open-source implementation of the 5G core network (10.0 CRITICAL)
- CVE-2026-44326 — free5GC is an open-source implementation of the 5G core network (9.4 CRITICAL)
- CVE-2026-44325 — free5GC is an open-source implementation of the 5G core network (7.5 HIGH)
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