High severity · published Jan 28, 2026
CVE-2026-1521
Open5GS SGWC s5c-handler.c denial of service
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
A security flaw has been discovered in Open5GS up to 2.7.6. This affects the function sgwc_s5c_handle_bearer_resource_failure_indication of the file src/sgwc/s5c-handler.c of the component SGWC. Performing a manipulation results in denial of service. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The patch is named 69b53add90a9479d7960b822fc60601d659c328b. It is recommended to apply a patch to fix this issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Open5GS · Open5gs
2.7.0; 2.7.1; 2.7.2; 2.7.3; 2.7.4; 2.7.5; +1 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1521
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1521
github.com
https://github.com/open5gs/open5gs/
Patch
https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b
Exploit
https://github.com/open5gs/open5gs/issues/4268
Exploit
https://github.com/open5gs/open5gs/issues/4268#event-21989483261
Exploit
https://github.com/open5gs/open5gs/issues/4268#issue-3795012861
Permissions Required
https://vuldb.com/?ctiid.343192
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