CVE-2026-33062: free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter
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.
Other sources
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.
— MITRE
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33062?
CVE-2026-33062 has a severity rating that indicates it can lead to Denial of Service due to an Improper Input Validation vulnerability.
How do I fix CVE-2026-33062?
To fix CVE-2026-33062, upgrade to free5GC NRF version 1.4.2 or later, which addresses the vulnerability.
What impact does CVE-2026-33062 have on affected systems?
CVE-2026-33062 allows a remote attacker to crash the NRF service by sending a crafted HTTP GET request, resulting in a Denial of Service.
Which software versions are affected by CVE-2026-33062?
CVE-2026-33062 affects free5GC NRF versions prior to 1.4.2.
Can CVE-2026-33062 be exploited remotely?
Yes, CVE-2026-33062 can be exploited remotely by attackers sending malformed parameters to the NRF service.