# CVE-2026-82589 — Open5GS

> As of 2026-08-31, CVE-2026-82589 is a MEDIUM-severity vulnerability in Open5GS, CVSS v3.1 4.3, EPSS 0.3% (23.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-82589 as of 2026-08-31; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-31

## What is CVE-2026-82589?

A security flaw has been discovered in Open5GS up to 2.7.7. Impacted is the function amf_namf_comm_handle_n1_n2_message_transfer of the file src/amf/namf-handler.c of the component N1-N2 Message Handler. Performing a manipulation of the argument N1N2MessageTransferReqData.n2InfoContainer.smInfo.n2InfoContent.ngapIeType results in denial of service. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 2.8.0 is recommended to address this issue. The patch is named abf8a836564b966b5141110fc25ed413c4f17522. It is advisable to upgrade the affected component.

The record classifies CVE-2026-82589 under weakness class [CWE-404](https://cwe.mitre.org/data/definitions/404.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 36 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 4.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C`)
- **CVSS v4.0 base score:** 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 23.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-30, last modified 2026-08-31

## Is CVE-2026-82589 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **(vendor unspecified)**: Open5GS

## How to fix CVE-2026-82589

No vendor patch reference has been recorded for CVE-2026-82589 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-82589

No threat campaign in the Threadlinqs corpus currently references CVE-2026-82589, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-31.

**Vendor advisory and patch**

- [github.com — patch](https://github.com/open5gs/open5gs/commit/abf8a836564b966b5141110fc25ed413c4f17522)
- [github.com — patch (v2.8)](https://github.com/open5gs/open5gs/releases/tag/v2.8.0)

**Exploit and proof of concept**

- [github.com — exploit](https://github.com/open5gs/open5gs/issues/4396)

**Technical analysis**

- [vuldb.com — vdb entry](https://vuldb.com/vuln/397084)

**Third-party advisory**

- [vuldb.com — signature](https://vuldb.com/vuln/397084/cti)
- [vuldb.com — third party advisory](https://vuldb.com/cve/CVE-2026-82589)
- [vuldb.com — third party advisory (891892)](https://vuldb.com/submit/891892)

**Issue tracking and product pages**

- [github.com — product](https://github.com/open5gs/open5gs/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-82589
Full detection coverage and IOCs for threats exploiting CVE-2026-82589 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp