Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M
CVE-2026-40343free5GC UDR: Fail-open handling in PolicyDataSubsToNotifyPost allows unintended subscription creation
Medium 6.9
In plain English
A medium-severity security flaw in udr from free5gc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 8.6% (higher than 95% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/free5gc/udr | no fix listed | GHSA-jwch-w7wh-gqjm |
| Go | github.com/free5gc/udr | no fix listed | GO-2026-5482 |
Affected products (as reported)
Weakness: CWE-754 · Vector: 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
References
- https://github.com/free5gc/free5gc/security/advisories/GHSA-jwch-w7wh-gqjm x_refsource_CONFIRM