CVE-2026-40343
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 1.4.2, a fail-open request handling flaw in the UDR service causes the `/nudr-dr/v2/policy-data/subs-to-notify` POST handler to continue processing requests even after request body retrieval or deserialization errors. This may allow unintended creation of Policy Data notification subscriptions with invalid, empty, or partially processed input, depending on downstream processor behavior. As of time of publication, a patched version is not available.
- CVSS 4.0
- 6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N - CVSS 3.1
- 5.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N - EPSS
- 8.6% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-26)
- CWE
- CWE-754
- Published
- Modified
- Record from
- the NVD, synced
Affected
- free5gc:free5gc
- free5gc:udr
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jwch-w7wh-gqjm | Go | github.com/free5gc/udr | <=1.4.2 | no fix published |
| GO-2026-5482 | Go | github.com/free5gc/udr | all versions | no fix published |