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CVE-2026-4240

5.3 · MEDIUM

A vulnerability was determined in Open5GS up to 2.7.6.

Published Mar 16, 2026open5gsCWE-404EPSS 0.57%

Overview

CVE-2026-4240 is a medium-severity vulnerability affecting open5gs open5gs. It was published on March 16, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A vulnerability was determined in Open5GS up to 2.7.6. The affected element is the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b_aaa_cb/smf_s6b_sta_cb of the component CCA Handler. This manipulation causes denial of service. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.7.7 is sufficient to fix this issue. Patch name: 80eb484a6ab32968e755e628b70d1a9c64f012ec. Upgrading the affected component is recommended.

Remediation

Check the references section for vendor advisories and patches from open5gs. Update open5gs to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
open5gsopen5gs>= 0, < 2.7.7Affected

References

GitHubgithub.com/open5gs/open5gs/GitHubgithub.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ecGitHubgithub.com/open5gs/open5gs/issues/4343GitHubgithub.com/open5gs/open5gs/issues/4343#issue-4021871895GitHubgithub.com/open5gs/open5gs/releases/tag/v2.7.7Refvuldb.com/?ctiid.351182Refvuldb.com/?id.351182Refvuldb.com/?submit.771361

How CyberStrike helps

Frequently asked questions

What is CVE-2026-4240?

CVE-2026-4240 is a medium-severity vulnerability affecting open5gs open5gs. It was published on March 16, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-4240?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-4240?

Check the references section for vendor advisories and patches from open5gs. Update open5gs to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-4240?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-4240 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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