{"id":"CVE-2026-33062","aliases":["GHSA-7c47-xr7q-p6hg","GO-2026-4756"],"url":"https://o3.security/vulnerability/CVE-2026-33062","summary":"free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter","details":"**Impact**  \nThis is an Improper Input Validation vulnerability leading to Denial of Service.  \n- **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.  \n- **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\".  \n- **Affected Parties**: All deployments of free5GC v4.0.1 using the NRF discovery service.\n\n**Patches**  \nYes, the issue has been patched.  \nThe fix is implemented in PR free5gc/nrf#80 (commit: [add fix reference here]).  \nUsers should upgrade to the next release of free5GC that includes this commit.\n\n**Workarounds**  \nThere 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.","published":"2026-03-20T02:46:56.378Z","modified":"2026-08-12T03:51:33.270335424Z","cvss":null,"epss":{"score":0.00674,"percentile":0.50533,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/free5gc/nrf","fixedVersion":"1.4.2"}],"fix":{"url":"https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872","label":"free5gc/nrf@dac77d8"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33062.json"},{"type":"ADVISORY","url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33062"},{"type":"REPORT","url":"https://github.com/free5gc/free5gc/issues/777"},{"type":"FIX","url":"https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872"},{"type":"FIX","url":"https://github.com/free5gc/nrf/pull/80"},{"type":"PACKAGE","url":"https://github.com/free5gc/free5gc"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:33.270335424Z"}}