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TI-2026-29764 Aliases CVE-2026-41136GHSA-r99v-75p9-xqm5

free5GC AMF missing default case in Content-Type switch in HTTPUEContextTransfer

Priority MEDIUM 64CWE-440Published · 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
Fixed

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

Summary

free5GC AMF provides Access & Mobility Management Function (AMF) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. Prior to version 1.4.3, the `HTTPUEContextTransfer` handler in `internal/sbi/api_communication.go` does not include a `default` case in the `Content-Type` switch statement. When a request arrives with an unsupported `Content-Type`, the deserialization step is silently skipped, `err` remains `nil`, and the processor is invoked with a completely uninitialized `UeContextTransferRequest` object. Version 1.4.3 contains a fix.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00282 20th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed amf (free5gc): 1.4.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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
free5gcamfbefore 1.4.31.4.3Patch availableCNA
—github.com/free5gc/amf (Go)up to 1.4.3—No fix listedGHSA-r99v-75p9-xqm5
  • amf Vendorfree5gc Affected before 1.4.3 Fixed in 1.4.3 Patch available CNA
  • github.com/free5gc/amf (Go) Vendor— Affected up to 1.4.3 Fixed in — No fix listed GHSA-r99v-75p9-xqm5

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:free5gc:amf:*:*:*:*:*:go:*:*before 1.4.3Vulnerablefree5gc
cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*up to 4.2.1Vulnerablefree5gc
  • cpe:2.3:a:free5gc:amf:*:*:*:*:*:go:*:* Versions before 1.4.3 Vulnerable ·free5gc
  • cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:* Versions up to 4.2.1 Vulnerable ·free5gc

Remediation

  • Fix · CNA amf (free5gc) Fixed in 1.4.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-41136
  2. 2026-10-03 Alias added: GHSA-r99v-75p9-xqm5

References

Exploit 1

Advisory 1

Other 2

  • TI-2025-42701 free5GC has Array Index Out of Bounds in AMF Leading to Denial of Service CVSS 4.0MEDIUM 6.6

Sources

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