# CVE-2026-90707

## Summary

- **CVE ID:** CVE-2026-90707
- **Severity:** MEDIUM
- **CVSS Score:** 8.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:X)
- **CWE:** CWE-416, CWE-119
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 15, 2026

## 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

- n/a — Open5GS (2.0)
- n/a — Open5GS (2.1)
- n/a — Open5GS (2.2)
- n/a — Open5GS (2.3)
- n/a — Open5GS (2.4)
- n/a — Open5GS (2.5)
- n/a — Open5GS (2.6)
- n/a — Open5GS (2.7)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.31%
- **EPSS Percentile:** 24.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._