Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Open5Gs | Open5Gs | < 2.7.7 |
Related Weaknesses (CWE)
References
- https://github.com/open5gs/open5gs/Product
- https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012Patch
- https://github.com/open5gs/open5gs/issues/4343Issue TrackingThird Party Advisory
- https://github.com/open5gs/open5gs/issues/4343#issue-4021871895ExploitIssue TrackingThird Party Advisory
- https://github.com/open5gs/open5gs/releases/tag/v2.7.7Release Notes
- https://vuldb.com/?ctiid.351182Permissions RequiredVDB Entry
- https://vuldb.com/?id.351182Third Party AdvisoryVDB Entry
- https://vuldb.com/?submit.771361ExploitThird Party AdvisoryVDB Entry
FAQ
What is CVE-2026-4240?
CVE-2026-4240 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 ca...
How severe is CVE-2026-4240?
CVE-2026-4240 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-4240?
Check the references section above for vendor advisories and patch information. Affected products include: Open5Gs Open5Gs.