CVE-2026-1586
Published: 29 January 2026
Summary
CVE-2026-1586 is a medium-severity Improper Resource Shutdown or Release (CWE-404) vulnerability in Open5Gs Open5Gs. Its CVSS base score is 5.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 48.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-1586 is a vulnerability in Open5GS versions up to and including 2.7.5, affecting the ogs_gtp2_f_teid_to_ip function within the file /sgwc/s11-handler.c of the SGWC component. This flaw, classified under CWE-404, enables a denial-of-service condition with a CVSS v3.1 base score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). The issue was published on 2026-01-29.
A remote attacker with no privileges or user interaction required can exploit this vulnerability over the network with low complexity, triggering improper resource handling that leads to partial denial of service on the affected SGWC component. No impact on confidentiality or integrity is possible.
Advisories recommend applying a patch, as the issue is already fixed; relevant discussions and fixes are documented in Open5GS GitHub repository issue #4273. An exploit has been publicly disclosed and may be used.
The vulnerability has seen an exploit published, increasing the risk for unpatched Open5GS deployments in 5G core network environments.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-4997
Vulnerability details
A flaw has been found in Open5GS up to 2.7.5. Impacted is the function ogs_gtp2_f_teid_to_ip of the file /sgwc/s11-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack may be performed from remote. The…
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exploit has been published and may be used. It is advisable to implement a patch to correct this issue. The issue report is flagged as already-fixed.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated exploitation of the resource handling flaw directly enables application/system DoS via vulnerability trigger (T1499.004).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires applying the published patch that eliminates the ogs_gtp2_f_teid_to_ip flaw in Open5GS SGWC.
Implements protections against network-exploitable resource exhaustion that produces the observed partial DoS condition.
Enforces input validation on GTPv2 TEID/IP fields processed by s11-handler.c, blocking the malformed data that triggers improper resource handling.