---
id: CVE-2026-91855
title: A security flaw has been discovered in Open5GS up to 2.7.7
summary: >-
  A security flaw has been discovered in Open5GS up to 2.7.7. Affected by this
  vulnerability is an unknown functionality of the file lib/pfcp/handler.c of
  the component PFCP Message Handler. Performing a manipulation results in
  denial of s…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-404
product: Open5GS
affected:
  - Open5GS 2.7.0
  - Open5GS 2.7.1
  - Open5GS 2.7.2
  - Open5GS 2.7.3
  - Open5GS 2.7.4
  - Open5GS 2.7.5
  - Open5GS 2.7.6
  - Open5GS 2.7.7
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:49.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91855'
references:
  - url: 'https://github.com/open5gs/open5gs/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/open5gs/open5gs/commit/028e1dbb5e3271035ccee906ef417a97fc523f71
    label: cna@vuldb.com
  - url: 'https://github.com/open5gs/open5gs/issues/4699'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-91855'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/933834'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/404086'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/404086/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-15T17:44:31.315009Z'
ingestedAt: '2026-09-15T17:41:02.867Z'
epss: 0.00724
epssPercentile: 0.52009
---

## Overview

A security flaw has been discovered in Open5GS up to 2.7.7. Affected by this vulnerability is an unknown functionality of the file lib/pfcp/handler.c of the component PFCP Message Handler. Performing a manipulation results in denial of service. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The patch is named 028e1dbb5e3271035ccee906ef417a97fc523f71. Applying a patch is the recommended action to fix this issue. CVE-2025-29339 describes a different assertion failure vulnerability in Open5GS UPF.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.