CVE-2026-44329: free5GC is an open-source implementation of the 5G core network

Q: How do I fix CVE-2026-44329?

free5gc: upgrade to 4.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-44329 being exploited?

CVE-2026-44329 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44329 affect?

CVE-2026-44329 affects free5gc. Severity is critical (CVSS 10.0). free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without OAuth2/bearer-token authorization middleware. A network attacker who can reach SMF on the SBI can h

Q: How urgent is CVE-2026-44329?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADE

CVE-2026-44329 is a critical-severity flaw (CVSS 10.0) affecting free5gc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without OAuth2/bearer-token authorization middleware. A network attacker who can reach SMF on the SBI can hit UPI endpoints with no Authorization header at all, and the requests reach the SMF business handlers. In the running Docker lab this was directly demonstrated for read (GET /upi/v1/upNodesLinks), write (POST

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-306, CWE-862
Published	2026-05-27
Last modified	2026-10-14

Publisher (CNA): GitHub, Inc. · Vendor: free5gc

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 17:16 UTCPublished CVE record published
2026-10-14 20:10 UTCUpdated Record last modified

free5gc free5gc UPGRADE

Affected: < 4.2.2

Fixed in: 4.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy free5gc || rpm -q free5gc || free5gc --version

2. UPGRADE to 4.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade free5gc

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade free5gc

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44329?

free5gc: upgrade to 4.2.2. Exact commands for each OS are on this page.

Is CVE-2026-44329 being exploited?

CVE-2026-44329 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44329 affect?

CVE-2026-44329 affects free5gc. Severity is critical (CVSS 10.0). free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without OAuth2/bearer-token authorization middleware. A network attacker who can reach SMF on the SBI can h

How urgent is CVE-2026-44329?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Docker vulnerabilities

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References

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