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CVE-2026-33062— free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter

Quick assessment

Affected
free5gc nrf
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.

nrf是free5GC开源的一个网络存储库功能模块。 nrf 1.4.2之前版本存在访问控制错误漏洞，该漏洞源于EncodeGroupId函数输入验证不当，可能导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 1.03% · P63

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-33062

Vulnerability Information
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Vulnerability Title
free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
free5GC is an open source 5G core network. free5GC NRF prior to version 1.4.2 has an Improper Input Validation vulnerability leading to Denial of Service. All deployments of free5GC using the NRF discovery service are affected. The `EncodeGroupId` function attempts to access array indices [0], [1], [2] without validating the length of the split data. When the parameter contains insufficient separator characters, the code panics with "index out of range". A remote attacker can cause the NRF service to panic and crash by sending a crafted HTTP GET request with a malformed `group-id-list` parameter. This results in complete denial of service for the NRF discovery service. free5GC NRF version 1.4.2 fixes the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the NRF API to trusted sources only.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
nrf 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nrf是free5GC开源的一个网络存储库功能模块。 nrf 1.4.2之前版本存在访问控制错误漏洞，该漏洞源于EncodeGroupId函数输入验证不当，可能导致拒绝服务。
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 nrf < 1.4.2 -

II. Public POCs for CVE-2026-33062

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III. Intelligence Information for CVE-2026-33062

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Patches & Fixes for CVE-2026-33062 (3)

Vendor Advisories for CVE-2026-33062 (1)

Same Patch Batch · free5gc · 2026-03-20 · 7 CVEs total

CVE-2026-32937 free5GC CHF has Out-of-Bounds Slice Access that Leads to DoS
CVE-2026-33063 free5GC AUSF UE Authentication Panic on Nil SuciSupiMap Interface Conversion
CVE-2026-33064 free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference
CVE-2026-33065 free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscripti
CVE-2026-33191 free5GC UDM vulnerable to null byte injection in URL path parameters causing 500 Internal
CVE-2026-33192 free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptio

IV. Related Vulnerabilities

Same vendor: free5gc
Same weakness: CWE-284

V. Comments for CVE-2026-33062

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