CVE-2026-44318

MEDIUM EPSS 18.3%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.3
Exploitability
1.6
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
18.3% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-362
CWE-820

Affected Products 1

VendorProductVersionRange
free5gcfree5gc* <4.2.2

References 4

  • github.com https://github.com/free5gc/bsf/commit/277908565fd628d974a13ef562b81a8b7b519ffa
    Patch
  • github.com https://github.com/free5gc/bsf/pull/7
    Issue TrackingPatch
  • github.com https://github.com/free5gc/free5gc/issues/926
    ExploitIssue Tracking
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-27ph-8q4f-h7m7
    ExploitVendor Advisory

Remediation

  • github.com https://github.com/free5gc/bsf/commit/277908565fd628d974a13ef562b81a8b7b519ffa
    Patch
  • github.com https://github.com/free5gc/bsf/pull/7
    Issue TrackingPatch