CVE Tools
Sign in

CVE-2026-40343

free5GC UDR: Fail-open handling in PolicyDataSubsToNotifyPost allows unintended subscription creation

Published: Apr 21, 2026Updated: Apr 23, 2026 Sources: CVE List NVDCWE-754
5.8MEDIUM
NVD MITRE
EPSS Score
10.0%
Top 4.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-754

Affected Products

free5gc
oss-projectaka free5gc udm, udm, free5gc smf, smf
udrOn-premNetwork Device
Networking Infrastructure / network-management
free5gcOn-premNetwork Device
Networking Infrastructure / router-switch

Exploitability

Official Patch Available

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-jwch-w7wh-gqjm
github.com

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-40343 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows