CVE-2026-44318 — 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-2026-44318MEDIUM

free5GC: BSF concurrent PUT /nbsf-management/v1/subscriptions/{subId} crashes the BSF process via concurrent map read/write on Subscriptions

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   L   N  U  N  N  H    5.3   .0027   19.1     —

AFFECTED
  Product  Versions   Fixed
  free5gc  < 4.2.2 –  —

TIMELINE
  May 5   Reserved by GitHub_M
  May 27  EXPLOIT PUBLISHED — CVE-2026-44318 (free5gc). Public exploit reference added.
  May 27  Published (CNA: GitHub_M)

CWE-362, CWE-820 · 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 BSF PUT /nbsf-management/v1/subscriptions/{subId} handler has an unsynchronized write on the global Subscriptions map. The handler first reads the map under RLock() via BSFContext.GetSubscription(subId), but if the subscription does not exist, ReplaceIndividualSubcription() writes back to the same map directly without taking the mutex (bsfContext.BsfSelf.Subscriptions[subId] = subscription). Under concurrent authenticated PUT load, one goroutine can read while another writes the map, which causes the Go runtime to abort the process with fatal error: concurrent map read and map write (Go runtime panics that come from concurrent map access bypass recover() and terminate the process). The BSF container exits with code 2 -- the entire BSF SBI surface goes down 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-2026-44318 (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-362 · CWE-820

References (4)

https://github.com/free5gc/bsf/commit/277908565fd628d974a13ef562b81a8b7b519ffa [Patch]
https://github.com/free5gc/bsf/pull/7 [Issue Tracking, Patch]
https://github.com/free5gc/free5gc/issues/926 [Exploit, Issue Tracking]
https://github.com/free5gc/free5gc/security/advisories/GHSA-27ph-8q4f-h7m7 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-44318 at cve.org

Vendors: free5gc

Weaknesses: CWE-362 · CWE-820

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44318 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.