CVE-2026-4531

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called 52e9386401ce56ea773c5aa587d4cdf7d53da799. It is best practice to apply a patch to resolve this issue.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

March 22, 2026

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Aug 7, 2026
Patch available. Sources: github_pr, github_commit.
generic

[Bugs] Out of order message sequence crashes AMF · Issue #792 · free5gc/free5gc · GitHub

https://github.com/free5gc/free5gc/issues/792
generic

GitHub - free5gc/free5gc: Open source 5G core network based on 3GPP R17 · GitHub

https://github.com/free5gc/free5gc/
github_pr Patch Available

fix: T3550 not running

Patch available: free5gc/amf v1.4.3 (PR #198 merged 2026-03-06)

https://github.com/free5gc/amf/pull/198
github_commit Patch Available

commit 52e9386401ce (free5gc/amf)

Patch available: free5gc/amf v1.4.3 (contains commit 52e9386401ce)

https://github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/free5gc/amf—1.4.3-0.20260306074636-52e9386401ce—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-23 00:19 UTCEPSS rescore
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  25. 2026-08-06 01:20 UTCEG score recompute
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  1. 2026-08-05 19:17 UTCEPSS rescore
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  16. 2026-07-23 03:16 UTCEG score recompute
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  20. 2026-07-19 14:31 UTCEPSS rescore
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  24. 2026-07-17 07:46 UTCOSV refresh
  25. 2026-07-16 17:03 UTCEPSS rescore
  26. 2026-07-15 16:57 UTCEPSS rescore
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  45. 2026-06-29 05:32 UTCOSV refresh
  46. 2026-06-28 14:07 UTCEPSS rescore
  47. 2026-06-28 04:56 UTCEPSS rescore
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  49. 2026-06-27 03:08 UTCEPSS rescore
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  73. 2026-06-10 22:19 UTCEPSS rescore
  74. 2026-06-10 13:22 UTCEPSS rescore
  75. 2026-06-08 14:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-4531?
CVE-2026-4531 is a medium vulnerability published on March 22, 2026. A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called…
When was CVE-2026-4531 disclosed?
CVE-2026-4531 was first published in the National Vulnerability Database on March 22, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4531 actively exploited?
CVE-2026-4531 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 64.5% of all scored CVEs.
What is the CVSS score of CVE-2026-4531?
CVE-2026-4531 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-4531?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4531, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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