Suse
CVE-2026-33062
HIGH
GHSA-7c47-xr7q-p6hg
Severity by source
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
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
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
Lifecycle Timeline
3DescriptionGitHub Advisory
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-listparameter. This results in complete denial of service for the NRF discovery service. - Functional Impact: The
EncodeGroupIdfunction 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.
AnalysisAI
NRF discovery service denial of service in free5GC v4.0.1 allows remote attackers to crash the service by sending HTTP GET requests with malformed group-id-list parameters that trigger unvalidated array access. The EncodeGroupId function fails to check split data length before accessing specific indices, causing an index out of range panic. A patch is available to address this input validation flaw affecting all deployments using the vulnerable NRF service.
Technical ContextAI
The vulnerability resides in the free5GC NRF component (pkg:go/github.com_free5gc_nrf), specifically in the EncodeGroupId function which handles group-id-list parameters during service discovery operations. Free5GC is an open-source 5G core network implementation written in Go. The root cause is CWE-284 (Improper Access Control), though the description indicates it manifests as an array index out-of-bounds error when the function attempts to access indices [0], [1], [2] of a split string without first validating the array length. This is a classic input validation failure where untrusted HTTP parameter data is processed without boundary checks, causing a Go panic and service crash.
RemediationAI
Apply the vendor-provided patch by upgrading to the next release of free5GC that includes commit dac77d8f8f2e0f041c5634fb3c685dcb9734b872 from pull request #80 available at https://github.com/free5gc/nrf/pull/80. The specific patched commit can be reviewed at https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872. As no application-level workaround exists, operators unable to immediately patch should implement network-level controls to restrict access to the NRF API endpoints to only trusted network functions and management sources. Deploy network segmentation and firewall rules to prevent untrusted or external sources from reaching the NRF service on TCP ports used for discovery requests.
Same weakness CWE-284 – Improper Access Control
View allSame technique Denial Of Service
View allVendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.5 | Fixed |
Share
External POC / Exploit Code
Leaving vuln.today