CVE-2026-44319

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 67% 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
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF terminates the entire process when a stored PFD-subscription notifyUri cannot be reached. In PfdChangeNotifier.FlushNotifications(), the notifier calls NnefPFDmanagementNotify(...) and on any delivery error invokes logger.PFDManageLog.Fatal(err), which is os.Exit(1)-equivalent in Go. An attacker who can create a PFD subscription with an attacker-chosen notifyUri and then trigger a PFD change can deterministically kill NEF on the asynchronous delivery attempt -- the process exits with status 1, dropping NEF's entire SBI surface until restart. This vulnerability is fixed in 4.2.2.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
32.5%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 28, 2026

Advisory Details (4)

Auto-updated Jun 6, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github.
github Patch Available🟡 PoC Available

NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-controlled notifyUri) · Advisory · free5gc/free5gc · GitHub

https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr
generic

[Bugs] NEF PFD notification failure fatally exits the process via bad NotifyUri · Issue #924 · free5gc/free5gc · GitHub

https://github.com/free5gc/free5gc/issues/924
github_pr Patch Available

fix: PFD notification failure fatally exits the process via bad NotifyUri

Patch available: free5gc/nef v1.2.3 (PR #25 merged 2026-03-25)

https://github.com/free5gc/nef/pull/25
github_commit Patch Available

commit f110517b1189 (free5gc/nef)

Patch available: free5gc/nef v1.2.3 (contains commit f110517b1189)

https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074

Vendor Advisories for CVE-2026-44319(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/free5gc/nef—1.2.3—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 56× 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 104 total refreshes for this CVE.

  1. 2026-07-12 05:46 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44319?
CVE-2026-44319 is a high vulnerability published on May 27, 2026. free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF terminates the entire process when a stored PFD-subscription notifyUri cannot be reached. In PfdChangeNotifier.FlushNotifications(), the notifier calls NnefPFDmanagementNotify(...) and on any delivery…
When was CVE-2026-44319 disclosed?
CVE-2026-44319 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44319 actively exploited?
CVE-2026-44319 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44319?
CVE-2026-44319 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-44319?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44319, 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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