CVE-2026-33904: GO-2026-4874 - Ella Core has a Denial of Service via SCTP connection cleanup deadlock in github.com/ellanetworks/core

CVE-2026-33904 · Severity: medium · CVSS 6.5 · Published 2026-03-27

Ella Core is a 5G core designed for private networks. Prior to version 1.7.0, a deadlock in the AMF's SCTP notification handler causes the entire AMF control plane to hang until the process is restarted. An attacker with access to the N2 interface can cause Ella Core to hang, resulting in a denial of service for all subscribers. Version 1.7.0 adds deferred Radio cleanup in serveConn SCTP server so that every connection exit path removes the radio. Remove the stale-entry scan from SCTP Notification handling.

Technologies: Ellanetworks Ella Core, github.com/ellanetworks/core (Go). Vendors: Ellanetworks, Go.

Quick answers

Is CVE-2026-33904 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33904 being exploited in the wild.
How severe is CVE-2026-33904?
Medium severity, with a CVSS score of 6.5, published 27 March 2026.
Which products and versions are affected?
github.com/ellanetworks/core (Go) SEMVER:introduced=0,fixed=1.7.0.
Is there a fix for CVE-2026-33904?
Yes. github.com/ellanetworks/core (Go): upgrade to 1.7.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33904?
Check whether you run Ellanetworks Ella Core or github.com/ellanetworks/core (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/ellanetworks/core (Go): upgrade to 1.7.0 or later
    go get github.com/ellanetworks/core@v1.7.0

Affected products

  • Ellanetworks Ella Core
  • github.com/ellanetworks/core (Go) SEMVER:introduced=0,fixed=1.7.0

Identifiers

  • CVE-2026-33904
  • GHSA-9h59-p45g-445h
  • GO-2026-4874

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