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CVE-2026-1522— Open5GS SGWC s5c-handler.c sgwc_s5c_handle_modify_bearer_response 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sgwc_s5c_handle_modify_bearer_response函数的错误操作，可能导致拒绝服务攻击。

CVSS 5.3 · Medium EPSS 0.66% · P48

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-1522

Vulnerability Information
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Vulnerability Title
Open5GS SGWC s5c-handler.c sgwc_s5c_handle_modify_bearer_response denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Open5GS up to 2.7.6. This vulnerability affects the function sgwc_s5c_handle_modify_bearer_response of the file src/sgwc/s5c-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. This patch is called b19cf6a. Applying a patch is advised to resolve this issue. The issue report is flagged as already-fixed.
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sgwc_s5c_handle_modify_bearer_response函数的错误操作，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-2026-1522

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III. Intelligence Information for CVE-2026-1522

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Vendor Advisories for CVE-2026-1522 (1)

Other References for CVE-2026-1522 (2)

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

CVE-2026-1521 5.3 MEDIUM Open5GS SGWC s5c-handler.c denial of service
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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-2026-1522

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