CVE-2026-91855 Open5GS PFCP Message handler.c denial of service
Remote attackers can cause a denial of service in Open5GS by manipulating PFCP messages, requiring a patch to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-91855?
CVE-2026-91855 is a medium-severity denial of service vulnerability in Open5GS, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-404
Which versions are affected by CVE-2026-91855?
How do I fix CVE-2026-91855?
No fix has been published for CVE-2026-91855 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-91855 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91855 exists.
Sources
Also known as GHSA-jvrm-386x-vcpc.