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CVE

CVE-2026-33062

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.7
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hg, https://nvd.nist.gov/vuln/detail/CVE-2026-33062, https://github.com/free5gc/free5gc/issues/777, https://github.com/free5gc/nrf/pull/80, https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872, https://github.com/free5gc/free5gc

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.00084%
EPSS Percentile
0.24332%
Introduced Version
0
Fix Available
1.4.2

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