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CVE-2026-55068— free5GC: NRF nnrf-nfm lacks NF Profile input validation — enables NF Registration Poisoning with arbitrary service endpoints

Quick assessment

Affected
free5gc 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 5G 核心网的开源实现。在 4.2.2 及更早版本中，NRF 的 RegisterNFInstance 处理器（位于 PUT /nnrf-nfm/v1/nf-instances/{nfInstanceID}）在接收 NF Profile 时未强制校验以下约束： UUID 格式 nfStatus 枚举值 heartBeatTimer 取值范围 必需的 profile 字段 nfServices.ipEndPoints 的地址约束 这些格式或取值不合法的 NF Profile 会被持久化存储到 Mo

CVSS 9.3 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
free5gc free5gc < 4.2.3 affected
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I. Basic Information for CVE-2026-55068

Vulnerability Information
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Vulnerability Title
free5GC: NRF nnrf-nfm lacks NF Profile input validation — enables NF Registration Poisoning with arbitrary service endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
free5GC is an open-source implementation of the 5G core network. In 4.2.2 and earlier, the NRF RegisterNFInstance handler at PUT /nnrf-nfm/v1/nf-instances/{nfInstanceID} accepts NF Profiles without enforcing UUID format, nfStatus enum values, heartBeatTimer ranges, mandatory profile fields, or nfServices.ipEndPoints address constraints. The invalid profiles are persisted in the MongoDB NfProfile collection and returned by NFDiscover, allowing an attacker with SBI access to advertise attacker-controlled network-function endpoints and redirect control-plane signaling. This can expose credentials and signaling, alter service discovery integrity, and deny service across network functions that trust the NRF. This issue is fixed in version 4.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
free5gc free5gc < 4.2.3 -

II. Public POCs for CVE-2026-55068

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III. Intelligence Information for CVE-2026-55068

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Patches & Fixes for CVE-2026-55068 (2)

Vendor Advisories for CVE-2026-55068 (1)

Vendor Pages for CVE-2026-55068 (2)

Other References for CVE-2026-55068 (1)

Same Patch Batch · free5gc · 2026-08-28 · 3 CVEs total

CVE-2026-55784 7.5 HIGH free5GC AUSF authentication contexts can be overwritten by concurrent requests for the sam
CVE-2026-55785 3.7 LOW free5GC AUSF uses non-constant-time authentication comparisons and logs XRES* in 5G-AKA

IV. Related Vulnerabilities

Same product: free5gc
Same vendor: free5gc
Same weakness: CWE-20

V. Comments for CVE-2026-55068

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