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TI-2026-29118 Aliases CVE-2026-40343GHSA-jwch-w7wh-gqjm

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

Priority MEDIUM 48CWE-754Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.08627 95th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
free5gcudrup to 1.4.2—No fix listedCNA
—github.com/free5gc/udr (Go)up to 1.4.2—No fix listedGHSA-jwch-w7wh-gqjm
  • udr Vendorfree5gc Affected up to 1.4.2 Fixed in — No fix listed CNA
  • github.com/free5gc/udr (Go) Vendor— Affected up to 1.4.2 Fixed in — No fix listed GHSA-jwch-w7wh-gqjm

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*up to 4.2.1Vulnerablefree5gc
cpe:2.3:a:free5gc:udr:*:*:*:*:*:go:*:*up to 1.4.2Vulnerablefree5gc
  • cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:* Versions up to 4.2.1 Vulnerable ·free5gc
  • cpe:2.3:a:free5gc:udr:*:*:*:*:*:go:*:* Versions up to 1.4.2 Vulnerable ·free5gc

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40343
  2. 2026-10-03 Alias added: GHSA-jwch-w7wh-gqjm
  3. 2026-10-25 EPSS moved to the 95th–99th percentile
  4. 2026-10-25 Priority changed: LOW → MEDIUM

References

Patch 1

Advisory 1

Other 1

  • TI-2026-32298 Incorrect authorization in free5gc CVSS 3.1CRITICAL 10.0
  • TI-2026-32297 free5GC: SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers CVSS 3.1CRITICAL 10.0
  • TI-2026-32295 free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler CVSS 3.1CRITICAL 10.0
  • TI-2025-39412 free5gc v4.1.0 and before is vulnerable to Buffer Overflow. CVSS 3.1CRITICAL 9.8
  • TI-2026-32294 Missing authorization in free5gc CVSS 3.1CRITICAL 9.4
  • TI-2026-32283 Missing authorization in free5gc CVSS 3.1CRITICAL 9.4
See all 58 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences