CVE-2026-33062
highpriority · track · 30EPSS 0.007 · 53 %ileEUUSEPSS · scored 2026-10-28
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–8.7
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-7c47-xr7q-p6hgfree5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter2026-03-18ghsa · osvUS
**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.
- GO-2026-4756free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter in github.com/free5gc/nrf2026-03-23vendor · osvUS
free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter in github.com/free5gc/nrf
also known as (5)
Other names and identifiers for this entity.
sources
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references (13)
External citations — patches, advisories, analysis.
- https://github.com/free5gc/free5gc/issues/777cnnvd
- https://github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hgcnnvd
- https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872cnnvd
- https://github.com/free5gc/nrf/pull/80cnnvd
- https://github.com/free5gc/nrf/releasesPatchcnnvd
- https://github.com/free5gc/free5gc/issues/777enisa_euvd
- https://github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hgenisa_euvd
- https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872enisa_euvd
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