CVE-2026-44329free5GC: SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers
- 10.0CriticalCVSS base score
- 0.33%Exploitation in 30 daysEPSS · top 73% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
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 OAuth2/bearer-token authorization middleware. A network attacker who can reach SMF on the SBI can hit UPI endpoints with no Authorization header at all, and the requests reach the SMF business handlers. In the running Docker lab this was directly demonstrated for read (GET /upi/v1/upNodesLinks), write (POST /upi/v1/upNodesLinks with attacker-controlled UP-node and link payload), and delete (DELETE /upi/v1/upNodesLinks/{nodeID}) operations. This vulnerability is fixed in 4.2.2.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. 2 references of the record are tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits2
References tagged exploit2 references
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3 (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/free5gc/free5gc/issues/887 (opens in a new tab)x_refsource_MISCexploit
Timeline
ID reserved
By GitHub_M
- 22 days later
· 22 days later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.33% · top 73% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 10.0.
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/free5gc/smfGHSA-3258-qmv8-frp3 (opens in a new tab)
References
References4
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3 (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/free5gc/free5gc/issues/887 (opens in a new tab)x_refsource_MISCexploit
- https://github.com/free5gc/smf/pull/197 (opens in a new tab)x_refsource_MISC
- https://github.com/free5gc/smf/commit/e23ce97565f285eb99eed153743c62bf4c767c6e (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-32569 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-3258-qmv8-frp3 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-44329)Record last updated .