CVE-2026-33904: Github.com/ellanetworks/core Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-9h59-p45g-445h
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CVSS 6.5
CWE-833
Published
Advisory Summary

CVE-2026-33904 is a MODERATE (CVSS 6.5) denial of service vulnerability (CWE-833: Deadlock) affecting Github.com/ellanetworks/core libraries in the Go ecosystem. The issue involves ella core has a denial of service via sctp connection cleanup deadlock. Remediation is available by upgrading affected packages to version 1.7.0.

CVE-2026-33904 at a Glance

CVE Identifier CVE-2026-33904
GHSA Identifier GHSA-9h59-p45g-445h
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-833: Deadlock
Affected Product Github.com/ellanetworks/core
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Adjacent (AV:A)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-33904

To remediate this vulnerability, upgrade all affected Github.com/ellanetworks/core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/ellanetworks/core fixed: 1.7.0 
Upgrade github.com/ellanetworks/core to 1.7.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/ellanetworks/core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-33904, inspect your project dependencies for Github.com/ellanetworks/core:

inspect dependencies for github.com/ellanetworks/core

Analyze the terminal output to locate any version of Github.com/ellanetworks/core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.7.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-833: Deadlock, where the product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. In Github.com/ellanetworks/core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Summary A deadlock in the AMF's SCTP notification handler causes the entire AMF control plane to hang until the process is restarted. ## Impact An attacker with access to the N2 interface can cause Ella Core to hang, resulting in a denial of service for all subscribers. ## Fix Add 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.

CVE-2026-33904 Affected Github.com/ellanetworks/core Versions

1 component(s)
Fixed Versions:
1.7.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/ellanetworks/core
golang/github.com/ellanetworks/core
Go
< 1.7.0
1.7.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ellanetworks/core/security/advisories/GHSA-9h59-p45g-445h
NVD — CVE-2026-33904 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33904
Security Fix Commit FIX COMMIT
https://github.com/ellanetworks/core/commit/999f606c5cae261471d9e3f063d7ecd1bd754076
Github.com/ellanetworks/core Source Repository REPOSITORY
https://github.com/ellanetworks/core
Github.com/ellanetworks/core Release RELEASE
https://github.com/ellanetworks/core/releases/tag/v1.7.0

Frequently Asked Questions

What is CVE-2026-33904?
CVE-2026-33904 is a security vulnerability in Github.com/ellanetworks/core involving Ella Core has a Denial of Service via SCTP connection cleanup deadlock under CWE-833: Deadlock.
Which Github.com/ellanetworks/core versions are affected?
Affected versions include releases prior to 1.7.0 across affected packages: github.com/ellanetworks/core.
What version fixes CVE-2026-33904?
Upgrading to 1.7.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/ellanetworks/core affected?
Yes, github.com/ellanetworks/core is affected in releases prior to 1.7.0. Upgrade your dependency to 1.7.0 or later.
What is the CVSS score of CVE-2026-33904?
CVE-2026-33904 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-33904?
CVE-2026-33904 is classified under CWE-833: Deadlock (The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock.).
How can I check Go dependencies for CVE-2026-33904?
Run the dependency tree command: 'inspect dependencies for github.com/ellanetworks/core'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9h59-p45g-445h",
  "modified" : "2026-03-27T21:51:35Z",
  "published" : "2026-03-26T22:13:33Z",
  "aliases" : [ "CVE-2026-33904" ],
  "summary" : "Ella Core has a Denial of Service via SCTP connection cleanup deadlock ",
  "details" : "## Summary\n\nA deadlock in the AMF's SCTP notification handler causes the entire AMF control plane to hang until the process is restarted. \n\n## Impact\n\nAn attacker with access to the N2 interface can cause Ella Core to hang, resulting in a denial of service for all subscribers.\n\n## Fix\n\nAdd 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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/ellanetworks/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.7.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ellanetworks/core/security/advisories/GHSA-9h59-p45g-445h"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33904"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ellanetworks/core/commit/999f606c5cae261471d9e3f063d7ecd1bd754076"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ellanetworks/core"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ellanetworks/core/releases/tag/v1.7.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-833" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-26T22:13:33Z",
    "nvd_published_at" : "2026-03-27T21:17:26Z"
  }
}