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Ella Core: AMF DoS via malformed PathSwitchRequest with empty NR security capability bitstrings

Moderate severity GitHub Reviewed Published Mar 12, 2026 in ellanetworks/core • Updated Mar 13, 2026

Package

gomod github.com/ellanetworks/core (Go)

Affected versions

< 1.5.1

Patched versions

1.5.1

Description

Summary

Ella Core panics when processing a PathSwitchRequest containing UE Security Capabilities with zero-length NR encryption or integrity protection algorithm bitstrings, resulting in a denial of service.

Impact

An attacker able to send crafted NGAP messages to Ella Core can crash the process, causing service disruption for all connected subscribers. No authentication is required.

Fix

Added length validation on NR algorithm bitstrings before accessing them in the PathSwitchRequest handler.

References

@gruyaume gruyaume published to ellanetworks/core Mar 12, 2026
Published to the GitHub Advisory Database Mar 12, 2026
Reviewed Mar 12, 2026
Last updated Mar 13, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

Weaknesses

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer. Learn more on MITRE.

CVE ID

CVE-2026-32320

GHSA ID

GHSA-j478-p7vq-3347

Source code

Credits

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