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CVE-2026-1976— Free5GC SMF SessionDeletionResponse null pointer dereference

Quick assessment

Affected
n/a Free5GC
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.

free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 Free5GC 4.1.0及之前版本存在代码问题漏洞，该漏洞源于SMF组件中SessionDeletionResponse函数存在缺陷，可能导致空指针取消引用。

CVSS 5.3 · Medium EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-1976

Vulnerability Information
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Vulnerability Title
Free5GC SMF SessionDeletionResponse null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Free5GC up to 4.1.0. Affected is the function SessionDeletionResponse of the component SMF. This manipulation causes null pointer dereference. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. It is suggested to install a patch to address 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
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
free5GC 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 Free5GC 4.1.0及之前版本存在代码问题漏洞，该漏洞源于SMF组件中SessionDeletionResponse函数存在缺陷，可能导致空指针取消引用。
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
- Free5GC 4.0 cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-1976

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III. Intelligence Information for CVE-2026-1976

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Patches & Fixes for CVE-2026-1976 (1)

Proof of Concept for CVE-2026-1976 (1)

Same Patch Batch · n/a · 2026-02-06 · 10 CVEs total

CVE-2026-2062 5.3 MEDIUM Open5GS PGW S5U Address sgwc_sxa_handle_session_modification_response null pointer derefer
CVE-2026-1979 5.3 MEDIUM mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free
CVE-2026-1975 5.3 MEDIUM Free5GC pfcp_reports.go identityTriggerType null pointer dereference
CVE-2026-1974 5.3 MEDIUM Free5GC SMF datapath.go ResolveNodeIdToIp denial of service
CVE-2026-1973 5.3 MEDIUM Free5GC SMF establishPfcpSession null pointer dereference
CVE-2026-1998 3.3 LOW micropython runtime.c mp_import_all memory corruption
CVE-2026-1991 3.3 LOW libuvc UVC Descriptor device.c uvc_scan_streaming null pointer dereference
CVE-2026-1990 3.3 LOW oatpp Type.hpp ObjectWrapper null pointer dereference
CVE-2025-70963 GoPhish 安全漏洞

IV. Related Vulnerabilities

Same product: Free5GC
Same vendor: n/a
Same weakness: CWE-476

V. Comments for CVE-2026-1976

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