High severity · published Sep 14, 2026
CVE-2026-90707
Open5GS Old AMF Discovery Fallback nnrf-handler.c amf_nnrf_try_old_amf_discovery_fallback use after free
8.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Open5GS · Open5gs
2.0; 2.1; 2.2; 2.3; 2.4; 2.5; +2 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90707
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90707
github.com
https://github.com/open5gs/open5gs/
github.com
https://github.com/open5gs/open5gs/commit/ddd683a35f8aaac2b7b9884a24cd53bddfc65238
github.com
https://github.com/open5gs/open5gs/pull/4698
vuldb.com
https://vuldb.com/cve/CVE-2026-90707
vuldb.com
https://vuldb.com/submit/918267
vuldb.com
https://vuldb.com/vuln/403249
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