CVE-2026-33062 free5GC NRF Discovery EncodeGroupId Function Panics on Malformed group-id-list Parameter
Remote attackers can crash the free5GC NRF discovery service by sending malformed HTTP requests, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33062?
CVE-2026-33062 is a high-severity denial of service vulnerability in Free5gc Free5gc, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-284
Which versions are affected by CVE-2026-33062?
3 open source packages ship an affected version, including github.com/free5gc/nrf. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/free5gc/nrf Go | All versions | 1.4.2 |
github.com/free5gc/nrf Go | All versions | 1.4.2 |
github.com/free5gc/nrf Go | All versions | 1.4.2 |
Products include Free5gc Free5gc.
How do I fix CVE-2026-33062?
Upgrade github.com/free5gc/nrf to 1.4.2 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-33062 being exploited?
There is no known exploitation of CVE-2026-33062 in the wild and no public exploit code.
Other vulnerabilities in Free5gc Free5gc
- CVE-2026-44327 free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler
- CVE-2026-44329 free5GC's SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers
- CVE-2026-44330 free5GC's NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD data and create/delete PFD subscriptions
- CVE-2025-63679 Memory corruption in n/a
- CVE-2026-44315 free5GC's NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, read, and delete PFD transactions
Sources
Also known as GHSA-7c47-xr7q-p6hg, GO-2026-4756.