Log in Start free

Vulnerability · Published Mar 20, 2026 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity improper access control in nrf from free5gc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.7%top 46.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/free5gc/nrf1.4.2GHSA-7c47-xr7q-p6hg
Gogithub.com/free5gc/nrf1.4.2GO-2026-4756

Affected products (as reported)

VendorProductVersions
free5gc nrf < 1.4.2

Weakness: CWE-284 · 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

References