CVE-2026-4988 Details
Description
A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.
A denial-of-service vulnerability has been identified in Open5GS version 2.7.6. The issue arises in the CCA Message Handler component, specifically within the 'smf_gx_cca_cb', 'smf_gy_cca_cb', and 'smf_s6b' functions. When a malicious Diameter peer sends a CCA message with an unknown or mismatched Session-ID, the session management function fails to find the session, leading to a process crash. This vulnerability allows for remote exploitation, causing the SMF process to terminate and disrupting all active user sessions.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/open5gs/open5gs/ | [email protected] | Product |
| https://github.com/open5gs/open5gs/issues/4342 | [email protected] | ExploitIssue Tracking |
| https://github.com/open5gs/open5gs/issues/4342#issue-4021772232 | [email protected] | Issue Tracking |
| https://vuldb.com/?ctiid.353875 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.353875 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.771349 | [email protected] | ExploitThird Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| open5gs open5gs | 2.7.6 |
CPE
Remediation
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Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 30, 2026 | Initial Analysis | [email protected] |
| Mar 27, 2026 | CVE Modified | [email protected] |
| Mar 27, 2026 | New CVE Received | [email protected] |