CVE-2026-41136: free5GC AMF provides Access & Mobility Management Function (AMF) for free5GC, an an open-source project for 5t

Q: How do I fix CVE-2026-41136?

amf: upgrade to 1.4.3; free5gc: upgrade to newer than 4.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-41136 being exploited?

CVE-2026-41136 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-2026-41136 affect?

CVE-2026-41136 affects amf, free5gc. Severity is medium (CVSS 5.3). 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_communica

Q: How urgent is CVE-2026-41136?

Priority 34/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADEUPGRADE

CVE-2026-41136 is a medium-severity flaw (CVSS 5.3) affecting amf, free5gc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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`, a

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-440
Published	2026-04-22
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 00:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

free5gc amf UPGRADE

Affected: < 1.4.3

Fixed in: 1.4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.4.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade amf

Note

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

free5gc free5gc UPGRADE

Affected: <= 4.2.1

Fixed in: newer than 4.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.2.1 (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-2026-41136?

amf: upgrade to 1.4.3; free5gc: upgrade to newer than 4.2.1. Exact commands for each OS are on this page.

Is CVE-2026-41136 being exploited?

CVE-2026-41136 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-2026-41136 affect?

CVE-2026-41136 affects amf, free5gc. Severity is medium (CVSS 5.3). 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_communica

How urgent is CVE-2026-41136?

Priority 34/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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