CVE-2026-30075: OpenAirInterface Version 2.2.0 has a Buffer Overflow vulnerability in processing UplinkNASTransport containing

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HIGH 7.5REMOTEDOWNGRADE

CVE-2026-30075 is a high-severity flaw (CVSS 7.5) affecting oai-cn5g-amf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenAirInterface Version 2.2.0 has a Buffer Overflow vulnerability in processing UplinkNASTransport containing Authentication Response containing a NAS PDU with oversize response (For example 100 byte). The response is decoded by AMF and passed to the AUSF component for verification. AUSF crashes on receiving this oversize response. This can prohibit users from further registration and verification and can cause Denial of Services (DoS).

Why this priority

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

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-120
Published	2026-04-08
Last modified	2026-07-25

Publisher (CNA): MITRE · Vendor: openairinterface

Last updated 2026-07-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 17:21 UTCPublished CVE record published
2026-07-25 10:10 UTCUpdated Record last modified

openairinterface oai-cn5g-amf DOWNGRADE

Affected: 2.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.0

1. Check installed version

apt-cache policy oai-cn5g-amf || rpm -q oai-cn5g-amf || oai-cn5g-amf --version

2. No fixed release: DOWNGRADE to a release before 2.2.0 (Debian / Ubuntu)

apt-cache madison oai-cn5g-amf sudo apt install oai-cn5g-amf=<VERSION_BEFORE_2.2.0> sudo apt-mark hold oai-cn5g-amf

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list oai-cn5g-amf sudo dnf downgrade oai-cn5g-amf-<VERSION_BEFORE_2.2.0> sudo dnf versionlock add oai-cn5g-amf

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-30075?

oai-cn5g-amf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-30075 being exploited?

CVE-2026-30075 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-2026-30075 affect?

CVE-2026-30075 affects oai-cn5g-amf. Severity is high (CVSS 7.5). OpenAirInterface Version 2.2.0 has a Buffer Overflow vulnerability in processing UplinkNASTransport containing Authentication Response containing a NAS PDU with oversize response (For example 100 byte). The response is decoded by AMF and pa

How urgent is CVE-2026-30075?

Priority 44/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-65805 HIGH 7.5 UPGRADE OpenAirInterface CN5G AMF<=v2.1.9 has a buffer overflow vulnerability in processing NAS messages
CVE-2026-30080 HIGH 7.5 DOWNGRADE OpenAirInterface v2.2.0 accepts Security Mode Complete without any integrity protection
CVE-2026-30079 CRITICAL 9.8 DOWNGRADE In OpenAirInterface V2.2.0 AMF, Out of sequence messages causes incorrect state transition during UE registrat
CVE-2026-30078 HIGH 7.5 DOWNGRADE OpenAirInterface V2.2.0 AMF crashes when it receives an NGAP message with invalid procedure code or invalid PD

References

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