CVE-2026-90707: Open5GS Old AMF Discovery Fallback nnrf-handler.c amf_nnrf_try_old_amf_discovery_fallback use after free

Severity: high (CVSS 8.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-14 · updated 2026-09-15
Weakness: CWE-119

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.

Affected products

Open5GS: 2.0, 2.1, 2.2, 2.3, 2.4, 2.5 (+2)

References

https://github.com/open5gs/open5gs/
https://github.com/open5gs/open5gs/commit/ddd683a35f8aaac2b7b9884a24cd53bddfc65238
https://github.com/open5gs/open5gs/pull/4698
https://vuldb.com/cve/CVE-2026-90707
https://vuldb.com/submit/918267
https://vuldb.com/vuln/403249
https://vuldb.com/vuln/403249/cti

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