CVE-2026-1521

Name: CVE-2026-1521
Creator: NVD / NIST
Published: 2026-01-28T15:16:17.493+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2026-1521 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0

5.5/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.51%

39.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-404

Affected Software

Vendor	Product	Versions
Open5gs	Open5gs	<= 2.7.6

References

https://github.com/open5gs/open5gs/
https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328bPatch
https://github.com/open5gs/open5gs/issues/4268Exploit, Issue Tracking, Vendor Advisory
https://github.com/open5gs/open5gs/issues/4268#event-21989483261Exploit, Issue Tracking, Vendor Advisory
https://github.com/open5gs/open5gs/issues/4268#issue-3795012861Exploit, Issue Tracking, Vendor Advisory
https://vuldb.com/?ctiid.343192Permissions Required, VDB Entry
https://vuldb.com/?id.343192Third Party Advisory, VDB Entry
https://vuldb.com/?submit.738370Exploit, Third Party Advisory, VDB Entry

Timeline

Published: Jan 28, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-1521?

How severe is CVE-2026-1521?

CVE-2026-1521 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2026-1521?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-1521?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST