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TI-2026-25504 Aliases CVE-2026-33062GHSA-7c47-xr7q-p6hg

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

Priority MEDIUM 45CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00707 53rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed nrf (free5gc): 1.4.2github.com/free5gc/nrf (Go): 1.4.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
free5gcnrfbefore 1.4.21.4.2Patch availableCNA
—github.com/free5gc/nrf (Go)before 1.4.21.4.2Patch availableGHSA-7c47-xr7q-p6hg
  • nrf Vendorfree5gc Affected before 1.4.2 Fixed in 1.4.2 Patch available CNA
  • github.com/free5gc/nrf (Go) Vendor— Affected before 1.4.2 Fixed in 1.4.2 Patch available GHSA-7c47-xr7q-p6hg

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*before 1.4.2Vulnerablefree5gc
  • cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:* Versions before 1.4.2 Vulnerable ·free5gc

Remediation

  • Fix · CNA nrf (free5gc) Fixed in 1.4.2
  • Fix · GHSA-7c47-xr7q-p6hg github.com/free5gc/nrf (Go) Fixed in 1.4.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33062
  2. 2026-10-03 Alias added: GHSA-7c47-xr7q-p6hg

References

Exploit 1

Patch 2

Advisory 2

Other 1

  • TI-2026-32298 Incorrect authorization in free5gc CVSS 3.1CRITICAL 10.0
  • TI-2026-32297 free5GC: SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers CVSS 3.1CRITICAL 10.0
  • TI-2026-32295 free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler CVSS 3.1CRITICAL 10.0
  • TI-2025-39412 free5gc v4.1.0 and before is vulnerable to Buffer Overflow. CVSS 3.1CRITICAL 9.8
  • TI-2026-32294 Missing authorization in free5gc CVSS 3.1CRITICAL 9.4
  • TI-2026-32283 Missing authorization in free5gc CVSS 3.1CRITICAL 9.4
See all 58 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences