# CVE-2026-44473: Ella Core: UE Downlink Redirection via Forged PDUSessionResourceSetupResponse

> Attackers can redirect user equipment traffic by forging session setup responses, bypassing association checks in Ella Core 5G networks.

- **Severity:** High 7.1 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 May 2026
- **Updated:** 28 May 2026
- **Also known as:** GHSA-qfxw-v8qx-vj3v, GO-2026-5581

## What is CVE-2026-44473?

CVE-2026-44473 is a high-severity missing authorization vulnerability in ellanetworks core, published on 27 May 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 1.10.0, a radio with a valid NG Setup can send a forged PDUSessionResourceSetupResponse carrying any UE's AMF-UE-NGAP-ID. Ella Core does not verify the message arrived on the SCTP association bound to that UE's logical NG-connection, then creates a GTP tunnel towards that radio. This vulnerability is fixed in 1.10.0.

Weakness: CWE-863 (Incorrect Authorization), CWE-358 (Improperly Implemented Security Check for Standard)

## Which versions are affected by CVE-2026-44473?

3 open source packages ship an affected version, including github.com/ellanetworks/core.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/ellanetworks/core` | Go | All versions | 1.10.0 |
| `github.com/ellanetworks/core` | Go | All versions | 1.10.0 |
| `github.com/ellanetworks/core` | Go | All versions | 1.10.0 |

## How do I fix CVE-2026-44473?

Upgrade github.com/ellanetworks/core to 1.10.0 or later.

## Is CVE-2026-44473 being exploited?

There is no known exploitation of CVE-2026-44473 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-44473 and fix it if it is affected.

What it is: CVE-2026-44473 is a high-severity missing authorization vulnerability in ellanetworks core, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-44473 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/ellanetworks/core (Go): affected all versions; fixed in 1.10.0
- github.com/ellanetworks/core (Go): affected all versions; fixed in 1.10.0
- github.com/ellanetworks/core (Go): affected all versions; fixed in 1.10.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-44473/ (Markdown: https://insights.sbomify.com/CVE-2026-44473/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-44473
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-44473
- OSV: https://osv.dev/vulnerability/CVE-2026-44473

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-44473/
Summaries are generated and may contain mistakes; the official description above is the record.