CVE-2026-44328 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-44328HIGH

free5GC: SMF UPI DELETE /upi/v1/upNodesLinks/{ref} panics on AN-node deletion via nil UPF dereference; unauthenticated, state-mutating

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  L  H    8.2   .0032   25.3     —

AFFECTED
  Product  Versions   Fixed
  free5gc  < 4.2.2 –  —

TIMELINE
  May 5   Reserved by GitHub_M
  May 27  EXPLOIT PUBLISHED — CVE-2026-44328 (free5gc). Public exploit reference added.
  May 27  Published (CNA: GitHub_M)

CWE-306, CWE-476, CWE-862 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 5, 2026	Reserved	Reserved by GitHub_M
May 27, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44328 (free5gc). Public exploit reference added.
May 27, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
free5gc	free5gc	—	< 4.2.2	—

Weaknesses

CWE-306 · CWE-476 · CWE-862

References (4)

https://github.com/free5gc/free5gc/issues/905 [Exploit, Issue Tracking]
https://github.com/free5gc/free5gc/security/advisories/GHSA-p9mg-74mg-cwwr [Exploit, Vendor Advisory]
https://github.com/free5gc/smf/commit/b57bc48081c3d3a2f333d02eb78e4fd31a120deb [Patch]
https://github.com/free5gc/smf/pull/199 [Issue Tracking, Patch]

Authoritative record: CVE-2026-44328 at cve.org

Vendors: free5gc

Weaknesses: CWE-306 · CWE-476 · CWE-862

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44328 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.