CVE-2026-33062

HIGH
2026-03-18 https://github.com/free5gc/free5gc GHSA-7c47-xr7q-p6hg
8.7
CVSS 4.0
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CVSS Vector

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Analysis Generated
Mar 18, 2026 - 20:15 vuln.today
Patch Released
Mar 18, 2026 - 20:15 nvd
Patch available
CVE Published
Mar 18, 2026 - 20:05 nvd
HIGH 8.7

Tags

Denial Of Service Authentication Bypass

Description

**Impact** This is an Improper Input Validation vulnerability leading to Denial of Service. - **Security Impact**: 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. - **Functional Impact**: 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". - **Affected Parties**: All deployments of free5GC v4.0.1 using the NRF discovery service. **Patches** Yes, the issue has been patched. The fix is implemented in PR free5gc/nrf#80 (commit: [add fix reference here]). Users should upgrade to the next release of free5GC that includes this commit. **Workarounds** 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.

Analysis

NRF discovery service denial of service in free5GC v4.0.1 allows remote attackers to crash the service by sending HTTP GET requests with malformed group-id-list parameters that trigger unvalidated array access. The EncodeGroupId function fails to check split data length before accessing specific indices, causing an index out of range panic. …

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Remediation

Within 24 hours: Identify all free5GC 4.0.1 deployments in production and classify by criticality; implement network segmentation to restrict NRF access if possible. Within 7 days: Apply available vendor patch to all affected instances; coordinate with change management for scheduled deployment windows. …

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Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +44
POC: 0

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CVE-2026-33062 vulnerability details – vuln.today
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