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CVE-2026-1521— Open5GS SGWC s5c-handler.c denial of service

Quick assessment

Affected
n/a Open5GS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open5GS是Open5GS开源的一个 5G Core 和 Epc 的 C 语言开源实现，即 Lte/Nr 网络的核心网络。 Open5GS 2.7.6及之前版本存在安全漏洞，该漏洞源于对文件src/sgwc/s5c-handler.c中函数sgwc_s5c_handle_bearer_resource_failure_indication的操作不当，可能导致拒绝服务攻击。

CVSS 5.3 · Medium EPSS 0.59% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-1521

Vulnerability Information
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Vulnerability Title
Open5GS SGWC s5c-handler.c denial of service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
Open5GS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open5GS是Open5GS开源的一个 5G Core 和 Epc 的 C 语言开源实现，即 Lte/Nr 网络的核心网络。 Open5GS 2.7.6及之前版本存在安全漏洞，该漏洞源于对文件src/sgwc/s5c-handler.c中函数sgwc_s5c_handle_bearer_resource_failure_indication的操作不当，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- Open5GS 2.7.0 cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-1521

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III. Intelligence Information for CVE-2026-1521

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Vendor Advisories for CVE-2026-1521 (2)

Other References for CVE-2026-1521 (1)

Same Patch Batch · n/a · 2026-01-28 · 26 CVEs total

CVE-2026-1522 5.3 MEDIUM Open5GS SGWC s5c-handler.c sgwc_s5c_handle_modify_bearer_response denial of service
CVE-2026-1520 2.4 LOW rethinkdb Secondary Index cross site scripting
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CVE-2025-69602 AltumCode 66biolinks 安全漏洞
CVE-2025-69601 AltumCode 66biolinks 安全漏洞
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CVE-2022-40620 NETGEAR多款产品 安全漏洞
CVE-2022-40619 NETGEAR多款产品 安全漏洞
CVE-2025-65891 Oneflow 安全漏洞
CVE-2025-65889 Oneflow 安全漏洞
CVE-2025-65890 Oneflow 安全漏洞
CVE-2025-70999 Oneflow 安全漏洞
CVE-2025-71000 Oneflow 安全漏洞
CVE-2025-65887 Oneflow 安全漏洞
CVE-2025-65886 Oneflow 安全漏洞

Showing top 20 of 26 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Open5GS
Same vendor: n/a
Same weakness: CWE-404

V. Comments for CVE-2026-1521

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