CVE-2026-1522
Published: 28 January 2026
Summary
CVE-2026-1522 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 12.7th 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 improper resource handling (CWE-404) in SGWC directly enables application/system DoS via crafted network traffic.
NVD Description
A weakness has been identified in Open5GS up to 2.7.6. This vulnerability affects the function sgwc_s5c_handle_modify_bearer_response of the file src/sgwc/s5c-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The…
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exploit has been made available to the public and could be used for attacks. This patch is called b19cf6a. Applying a patch is advised to resolve this issue. The issue report is flagged as already-fixed.
Deeper analysisAI
CVE-2026-1522 is a vulnerability in Open5GS versions up to and including 2.7.6, affecting the SGWC component. Specifically, it resides in the sgwc_s5c_handle_modify_bearer_response function within the file src/sgwc/s5c-handler.c. The issue, classified under CWE-404, enables a denial of service through improper resource handling, 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 vulnerability can be exploited remotely by unauthenticated attackers with network access, requiring low complexity and no user interaction. Successful exploitation triggers a denial of service condition, disrupting service availability without impacting confidentiality or integrity.
Mitigation is available via the patch commit b19cf6a in the Open5GS GitHub repository, which resolves the issue as confirmed in issue tracker #4266. Security practitioners are advised to apply this patch promptly, as the vulnerability is already fixed upstream and an exploit has been publicly disclosed.
Details
- CWE(s)