CVE-2026-8266 Details
Description
A vulnerability was detected in Open5GS up to 2.7.7. This affects the function gsm_build_pdu_session_establishment_accept of the file /src/smf/gsm-build.c of the component SMF. The manipulation results in denial of service. The attack can be launched remotely. The exploit is now public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
A denial-of-service vulnerability has been identified in Open5GS versions through 2.7.7, specifically within the Session Management Function (SMF) component. The issue arises in the 'gsm_build_pdu_session_establishment_accept' function, located in 'src/smf/gsm-build.c'. The vulnerability can be exploited remotely by sending a crafted HTTP response that includes malformed base64-encoded Quality of Service (QoS) rules. This exploitation causes the SMF process to crash, as the software fails to properly handle the error, leading to an assertion failure and termination of the process.
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 May 12, 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/4447 | [email protected] | ExploitIssue Tracking |
| https://vuldb.com/submit/808483 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/vuln/362563 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/vuln/362563/cti | [email protected] | Permissions RequiredVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| open5gs open5gs | <= 2.7.7 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 12, 2026 | Initial Analysis | [email protected] |
| May 11, 2026 | New CVE Received | [email protected] |