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High, CVSS 7.1

Ella Core Vulnerable to UE Downlink Redirection via Forged PDUSessionResourceSetupResponse

CVE-2026-44473GHSA-qfxw-v8qx-vj3v

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/ellanetworks/core 1.10.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.1 · CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS
  • CVE-2026-44473: 0.17% estimated exploitation activity in the next 30 days; percentile 5.85 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary 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. Impact Downlink user-plane traffic for the targeted UE is redirected to the attacker's radio. Fix UE context lookups are now scoped to the sending radio's SCTP association.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-qfxw-v8qx-vj3v

Agent brief

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# Patch Next advisory brief: CVE-2026-44473

Advisory: Ella Core Vulnerable to UE Downlink Redirection via Forged PDUSessionResourceSetupResponse
IDs: CVE-2026-44473, GHSA-qfxw-v8qx-vj3v
Record: https://patchnext.com/advisories/cve-2026-44473 (revision 1, source checked 26 Oct 2026, 15:23 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/ellanetworks/core 1.10.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/ellanetworks/core: affected < 1.10.0; fixed in 1.10.0

## Suggested inspection (read-only)
- Go github.com/ellanetworks/core: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/ellanetworks/core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-qfxw-v8qx-vj3v (GitHub-reviewed advisory GHSA-qfxw-v8qx-vj3v lists affected ranges: Go github.com/ellanetworks/core >=0 <1.10.0)

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