CVE-2026-2521: Open5GS SGW-C sgwc_s5c_handle_create_session_response memory corruption

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-15 · updated 2026-06-17
Weakness: CWE-119

Description

A weakness has been identified in Open5GS up to 2.7.6. This issue affects the function sgwc_s5c_handle_create_session_response of the component SGW-C. Executing a manipulation can lead to memory corruption. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

Affected products

Open5GS: through 2.7.6

References

https://github.com/open5gs/open5gs/
https://github.com/open5gs/open5gs/issues/4282
https://github.com/open5gs/open5gs/issues/4282#issue-3807902188
https://vuldb.com/?ctiid.346109
https://vuldb.com/?id.346109
https://vuldb.com/?submit.738334

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