# CVE-2026-4531: GO-2026-5767 - Free5GC AMF is vulnerable to DoS through its HandleRegistrationComplete function in github.com/free5gc/amf

Source: https://junglewise.ai/threats/cve-2026-4531-free5gc-amf-is-vulnerable-to-dos-through-its  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-25  
License: CC BY 4.0 with a link back

CVE-2026-4531 · Severity: low · CVSS 3.1 · Published 2026-06-25

Free5GC AMF is vulnerable to DoS through its HandleRegistrationComplete function in github.com/free5gc/amf

Technologies: [github.com/free5gc/amf (Go)](https://junglewise.ai/threats/technologies/github-com-free5gc-amf). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-4531 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-4531 being exploited in the wild.

**How severe is CVE-2026-4531?** Low severity, with a CVSS score of 3.1, published 25 June 2026.

**Which products and versions are affected?** github.com/free5gc/amf (Go) SEMVER:introduced=0,fixed=1.4.3-0.20260306074636-52e9386401ce.

**Is there a fix for CVE-2026-4531?** Yes. github.com/free5gc/amf (Go): upgrade to 1.4.3-0.20260306074636-52e9386401ce or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-4531?** Check whether you run github.com/free5gc/amf (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/free5gc/amf (Go): upgrade to 1.4.3-0.20260306074636-52e9386401ce or later

  ```sh
  go get github.com/free5gc/amf@v1.4.3-0.20260306074636-52e9386401ce
  ```


## Affected products

- github.com/free5gc/amf (Go) SEMVER:introduced=0,fixed=1.4.3-0.20260306074636-52e9386401ce

## Identifiers

- CVE-2026-4531
- GHSA-xq44-64rg-8g3h
- GO-2026-5767

## Related threats

- [free5GC AMF improper security check in concurrent procedures](https://junglewise.ai/threats/cve-2026-42082-free5gc-amf-improper-security-check-in-concurrent-procedures)
- [free5GC AMF improper security check in NGAP PathSwitchRequest](https://junglewise.ai/threats/cve-2026-42081-free5gc-amf-improper-security-check-in-ngap-pathswitchrequest)
- [free5GC AMF: Missing default case in Content-Type switch in HTTPUEContextTransfer](https://junglewise.ai/threats/cve-2026-41136-free5gc-amf-missing-default-case-in-content-type-switch-in)
- [free5GC AMF denial of service vulnerability](https://junglewise.ai/threats/cve-2023-49391-free5gc-amf-denial-of-service-vulnerability)