Open5GS up to 2.7.7 PFCP Message lib/pfcp/handler.c denial of service

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k1.22+

Summaryinfo

A vulnerability was found in Open5GS up to 2.7.7 and classified as problematic. Affected by this issue is some unknown functionality of the file lib/pfcp/handler.c of the component PFCP Message Handler. Executing a manipulation can lead to denial of service. This vulnerability is handled as CVE-2026-91855. The attack can be executed remotely. Additionally, an exploit exists. It is best practice to apply a patch to resolve this issue. CVE-2025-29339 describes a different assertion failure vulnerability in Open5GS UPF.

Detailsinfo

A vulnerability has been found in Open5GS up to 2.7.7 and classified as problematic. This vulnerability affects an unknown code of the file lib/pfcp/handler.c of the component PFCP Message Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability.

The advisory is available at github.com. This vulnerability was named CVE-2026-91855. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. CVE-2025-29339 describes a different assertion failure vulnerability in Open5GS UPF.

Applying the patch 028e1dbb5e3271035ccee906ef417a97fc523f71 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 028e1dbb5e3271035ccee906ef417a97fc523f71

Timelineinfo

09/15/2026 Advisory disclosed
09/15/2026 +0 days VulDB entry created
09/15/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 4699
Status: Confirmed

CVE: CVE-2026-91855 (🔒)
GCVE (CVE): GCVE-0-2026-91855
GCVE (VulDB): GCVE-100-404086
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/15/2026 11:15
Changes: 09/15/2026 11:15 (59)
Complete: 🔍
Submitter: ea1809
Cache ID: 216::103

Submitinfo

Accepted

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