CVE-2026-90707 Open5GS Old AMF Discovery Fallback nnrf-handler.c amf_nnrf_try_old_amf_discovery_fallback use after free
Remote attackers can trigger a use-after-free in Open5GS AMF discovery, potentially leading to code execution or service disruption.
- 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-2026-90707?
CVE-2026-90707 is a medium-severity use after free vulnerability in Open5GS, published on 14 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.x. Affected is the function amf_nnrf_try_old_amf_discovery_fallback of the file src/amf/nnrf-handler.c of the component Old AMF Discovery Fallback. The manipulation of the argument discovery_option results in use after free. The attack may be performed from remote. The patch is identified as ddd683a35f8aaac2b7b9884a24cd53bddfc65238. Applying a patch is advised to resolve this issue.
Which versions are affected by CVE-2026-90707?
How do I fix CVE-2026-90707?
No fix has been published for CVE-2026-90707 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-90707 being exploited?
There is no known exploitation of CVE-2026-90707 in the wild and no public exploit code.
Sources
Also known as GHSA-wxvq-3xfq-q746.