high7.5
CVE-2026-42459
Free5GC UDM has Improper Input Validation and Generation of Error Messages Containing Sensitive Information
Impact
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/free5gc/udm | <= 1.4.3 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Free5gc | Free5gc | before 4.2.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-585v-hcgf-jhfr
- https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr
- https://github.com/free5gc/free5gc/security/advisories/GHSA-h4wg-rp7m-8xx4
- https://github.com/free5gc/udm/blob/v1.4.3/internal/sbi/api_subscriberdatamanagement.go
- https://nvd.nist.gov/vuln/detail/CVE-2026-42459