CVE-2026-44319 — 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-2026-44319HIGH

free5GC: NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-controlled notifyUri)

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0040   33.8     —

AFFECTED
  Product  Versions   Fixed
  free5gc  < 4.2.2 –  —

TIMELINE
  May 5   Reserved by GitHub_M
  May 27  EXPLOIT PUBLISHED — CVE-2026-44319 (free5gc). Public exploit reference added.
  May 27  Published (CNA: GitHub_M)

CWE-20, CWE-617, CWE-755 · 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 NEF terminates the entire process when a stored PFD-subscription notifyUri cannot be reached. In PfdChangeNotifier.FlushNotifications(), the notifier calls NnefPFDmanagementNotify(...) and on any delivery error invokes logger.PFDManageLog.Fatal(err), which is os.Exit(1)-equivalent in Go. An attacker who can create a PFD subscription with an attacker-chosen notifyUri and then trigger a PFD change can deterministically kill NEF on the asynchronous delivery attempt -- the process exits with status 1, dropping NEF's entire SBI surface until restart. 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-2026-44319 (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-20 · CWE-617 · CWE-755

References (4)

https://github.com/free5gc/free5gc/issues/924 [Exploit, Issue Tracking]
https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr [Exploit, Vendor Advisory]
https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074 [Patch]
https://github.com/free5gc/nef/pull/25 [Issue Tracking, Patch]

Authoritative record: CVE-2026-44319 at cve.org

Vendors: free5gc

Weaknesses: CWE-20 · CWE-617 · CWE-755

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44319 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.