Open5GS up to 2.8.0 PFCP ogs_pfcp_parse_dropped_dl_traffic_threshold out-of-bounds

Summaryinfo

A vulnerability identified as critical has been detected in Open5GS up to 2.8.0. This affects the function ogs_pfcp_parse_dropped_dl_traffic_threshold of the component PFCP. The manipulation leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2026-108103. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Open5GS up to 2.8.0. It has been rated as critical. This issue affects the function ogs_pfcp_parse_dropped_dl_traffic_threshold of the component PFCP. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Open5GS through 2.8.0 contains a heap out-of-bounds read vulnerability in ogs_pfcp_parse_dropped_dl_traffic_threshold() that allows remote unauthenticated attackers to read past IE buffers via short IEs. Attackers can send PFCP Session Establishment or Modification Requests to the UPF on UDP port 8805 with DLPA and DLBY flags set, potentially crashing the UPF.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-108103 since 10/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• Open5GS

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8.0

Website

• Product: https://github.com/open5gs/open5gs/

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