CVE-2026-1521
Open5GS SGWC s5c-handler.c denial of service
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.
INFO
Published Date :
Jan. 28, 2026, 3:16 p.m.
Last Modified :
Feb. 2, 2026, 7:44 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Apply patch 69b53add90a9479d7960b822fc60601d659c328b to Open5GS.
- Update Open5GS to a version that includes the fix.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1521.
| URL | Resource |
|---|---|
| https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b | Patch |
| https://github.com/open5gs/open5gs/issues/4268 | Exploit Issue Tracking Vendor Advisory |
| https://github.com/open5gs/open5gs/issues/4268#event-21989483261 | Issue Tracking Exploit Vendor Advisory |
| https://github.com/open5gs/open5gs/issues/4268#issue-3795012861 | Exploit Issue Tracking Vendor Advisory |
| https://vuldb.com/?ctiid.343192 | Permissions Required VDB Entry |
| https://vuldb.com/?id.343192 | Third Party Advisory VDB Entry |
| https://vuldb.com/?submit.738370 | Third Party Advisory VDB Entry Exploit |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1521 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1521
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1521 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-1521 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:* versions up to (including) 2.7.6 Added Reference Type VulDB: https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b Types: Patch Added Reference Type VulDB: https://github.com/open5gs/open5gs/issues/4268 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type VulDB: https://github.com/open5gs/open5gs/issues/4268#event-21989483261 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type VulDB: https://github.com/open5gs/open5gs/issues/4268#issue-3795012861 Types: Exploit, Issue Tracking, Vendor Advisory Added Reference Type VulDB: https://vuldb.com/?ctiid.343192 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.343192 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.738370 Types: Exploit, Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Jan. 28, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CVSS V2 (AV:N/AC:L/Au:N/C:N/I:N/A:P) Added CWE CWE-404 Added Reference https://github.com/open5gs/open5gs/commit/69b53add90a9479d7960b822fc60601d659c328b Added Reference https://github.com/open5gs/open5gs/issues/4268 Added Reference https://github.com/open5gs/open5gs/issues/4268#event-21989483261 Added Reference https://github.com/open5gs/open5gs/issues/4268#issue-3795012861 Added Reference https://vuldb.com/?ctiid.343192 Added Reference https://vuldb.com/?id.343192 Added Reference https://vuldb.com/?submit.738370