CVE-2026-33904 Ella Core has a Denial of Service via SCTP connection cleanup deadlock
An attacker with N2 interface access can trigger a deadlock in Ella Core's AMF, causing a denial of service for all subscribers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33904?
CVE-2026-33904 is a medium-severity denial of service vulnerability in ellanetworks core, published on 27 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-833
Which versions are affected by CVE-2026-33904?
3 open source packages ship an affected version, including github.com/ellanetworks/core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/ellanetworks/core Go | All versions | 1.7.0 |
github.com/ellanetworks/core Go | All versions | 1.7.0 |
github.com/ellanetworks/core Go | All versions | 1.7.0 |
Products include Ellanetworks Ella Core.
How do I fix CVE-2026-33904?
Upgrade github.com/ellanetworks/core to 1.7.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-33904 being exploited?
There is no known exploitation of CVE-2026-33904 in the wild and no public exploit code.
Other vulnerabilities in ellanetworks core
- CVE-2026-33282 Ella Core panics on malformed NGAP Location Report
- CVE-2026-32319 Ella Core: Unauthenticated AMF DoS via malformed InitialUEMessage with undersized integrity-protected NAS payload
- CVE-2026-33906 Ella Core has Privilege Escalation via Database Restore by NetworkManager role
- CVE-2026-33903 Ella Core panics when processing a crafted NGAP LocationReport message
- CVE-2026-33907 Ella Core Panics during NAS Authentication Response/Failure with missing IEs
Sources
Also known as GHSA-9h59-p45g-445h, GO-2026-4874.