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 5.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 28.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Contingency plan updates incorporate proper resource shutdown and release steps, preventing attackers from leveraging incomplete cleanup during recovery scenarios.
Mandates explicit shutdown of the network connection at session conclusion, directly addressing improper resource release.
Requires proper shutdown/release procedures that include overwriting or isolating data to block unintended transfer via reused system objects.
Procedures can mandate orderly shutdown or release of resources when failures occur, preventing improper resource handling after a fault.
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).
NVD Description
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…
more
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.
Deeper analysisAI
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.
Details
- CWE(s)