CVE-2026-91855: Open5GS PFCP Message handler.c denial of service
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Open5GSto a version that resolves this vulnerability.Fixed in 2.7.7Patch 028e1dbb5e3271035ccee906ef417a97fc523f71
Event History
Frequently Asked Questions
Which Open5GS versions should be considered affected?
Open5GS versions up to and including 2.7.7 are affected. The provided data does not identify a fixed release version; it identifies patch 028e1dbb5e3271035ccee906ef417a97fc523f71 as the remediation.
What access does an attacker need to trigger the denial of service?
Exploitation is remote and requires no privileges or user interaction, according to the supplied vector. An attacker must be able to send manipulated traffic to the PFCP Message Handler.
How urgent is remediation?
A public exploit has been released and may be used in attacks. Applying the identified patch is the recommended remediation.