CVE-2026-30045

Deferred Deferred - Pending Action

Integer Overflow in Open5GS NF Instances Causes DoS

Publication date: 2026-08-27

Last updated on: 2026-08-31

Assigner: MITRE

Description

An integer overflow in the /nnrf-disc/v1/nf-instances component of open5gs v2.7.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted HTTP/2 GET request.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-27

Last Modified

2026-08-31

Generated

2026-09-17

AI Q&A

2026-08-27

EPSS Evaluated

2026-09-15

NVD

CVE-2026-30045

EUVD

EUVD-2026-67102

Affected Vendors & Products

Vendor	Product	Version / Range
open5gs	open5gs	2.7.6

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer overflow in Open5GS version 2.7.6 affecting the /nnrf-disc/v1/nf-instances component. Attackers can send a crafted HTTP/2 GET request with an excessively large value in the requester-features parameter, causing an integer overflow during parsing. This leads to a crash in the Network Repository Function (NRF) due to a fatal assertion error in the string-to-integer conversion function, resulting in a segmentation fault.

Detection Guidance

Monitor for crashes in the Open5GS NRF process, particularly after receiving HTTP/2 requests with large values in the 'requester-features' parameter. Check logs for segmentation faults or assertion errors in the NRF component.

Impact Analysis

This vulnerability can cause a Denial of Service (DoS) by crashing the NRF component of Open5GS. If exploited, it may disrupt network services relying on the NRF, leading to service unavailability for users and systems dependent on this function.

Compliance Impact

This vulnerability primarily causes a Denial of Service (DoS) by crashing the NRF component in Open5GS. While it does not directly expose or leak data, a DoS condition could disrupt network services, potentially impacting availability of systems handling personal or sensitive data. This may indirectly affect compliance with standards like GDPR (which requires availability of data processing systems) or HIPAA (which mandates reliable access to protected health information). However, the CVE itself does not provide specific compliance implications beyond service disruption.

Mitigation Strategies

Upgrade Open5GS to a patched version beyond v2.7.6. Implement input validation to reject malformed HTTP/2 requests with excessively large values in the 'requester-features' parameter. Use network firewalls or WAFs to filter suspicious requests targeting the /nnrf-disc/v1/nf-instances endpoint.

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