CVE-2026-33281: Ella Core panics on invalid PDU Session IDs in NGAP messages

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-24 · updated 2026-06-17
Weakness: CWE-129

Description

Ella Core is a 5G core designed for private networks. Versions prior to 1.6.0 panic when processing NGAP messages with invalid PDU Session IDs outside of 1-15. 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. Version 1.6.0 added PDU Session ID validations during NGAP message handling.

Affected products

ellanetworks core: before 1.6.0 — fixed in 1.6.0

How to fix

Upgrade to a fixed version: ellanetworks core 1.6.0. Check the vendor advisory for mitigations.

References

https://github.com/ellanetworks/core/security/advisories/GHSA-q669-4gmv-g8mf

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