High severity · published Jul 14, 2026
CVE-2026-15720
Pre-auth heap out-of-bounds read in the AMF NAS 5GS mobile-identity handler
8.6
CVSS
0.5%
EPSS
No
On KEV
Description
In Open5GS through version 2.7.7 a pre-authentication heap out-of-bounds read in the AMF NAS 5GS mobile-identity handler may result in subscriber-wide denial of service.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
open5gs · open5gs
through 2.7.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15720
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-15720
github.com
https://github.com/open5gs/open5gs/security/advisories/GHSA-f4mx-3x6p-cfwp
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