PatchTheCVECVE-2026-27643: free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) m
CVE-2026-27643 is a medium-severity flaw (CVSS 5.3) affecting udr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be affected. free5gc/udr
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 76%) |
| CISA exploited list | No |
| Weakness | CWE-209 |
| Published | 2026-02-24 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-27643?
udr: upgrade to newer than 1.4.1. Exact commands for each OS are on this page.
Is CVE-2026-27643 being exploited?
CVE-2026-27643 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-27643 affect?
CVE-2026-27643 affects udr. Severity is medium (CVSS 5.3). free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the NEF component reliably leaks internal parsing error details (e.g.,
How urgent is CVE-2026-27643?
Priority 35/100. Public exploit reference; Remotely exploitable, no login, no user action
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