Cyber Resilience

CVE-2026-8290

Open5Gs ≤ 2.7.7

Public PoC
Published
11 May 2026
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v4 2.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0037 30th percentile
Risk Priority 15 floored blend · peak EPSS

Summary

CVE-2026-8290 is a low-severity Improper Resource Shutdown or Release (CWE-404) vulnerability in Open5Gs Open5Gs. Its CVSS base score is 2.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 30th 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 map to SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

A security flaw has been discovered in Open5GS up to 2.7.7. This issue affects the function smf_nsmf_handle_update_data_in_vsmf of the file /src/smf/nsmf-handler.c of the component SMF. The manipulation results in denial of service. The attack can be executed remotely. The exploit…

more

has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

CWE(s)
CWE-404

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Remote DoS via crafted input to SMF service directly matches application/system exploitation for endpoint denial of service.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Likely ATT&CK TechniquesAI

Techniques this vulnerability likely enables, inferred from its description, weakness type, and attributed-actor tradecraft. Confidence is per-technique.

T1499.004 Application or System Exploitation Impactconfidence: HIGH
Remote exploitation of the flaw in SMF handler directly causes application/service denial of service.
attack.mitre.org →
inferred from description + CWE · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-8120Same product: Open5Gs Open5Gs
CVE-2026-8222Same product: Open5Gs Open5Gs
CVE-2026-4240Same product: Open5Gs Open5Gs
CVE-2026-1586Same product: Open5Gs Open5Gs
CVE-2026-8250Same product: Open5Gs Open5Gs
CVE-2026-8728Same product: Open5Gs Open5Gs
CVE-2025-1925Same product: Open5Gs Open5Gs
CVE-2025-8801Same product: Open5Gs Open5Gs
CVE-2026-8729Same product: Open5Gs Open5Gs
CVE-2026-8123Same product: Open5Gs Open5Gs

Affected Assets

open5gs
open5gs
≤ 2.7.7

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SC-5 Denial-of-service Protection
  • SI-2 Flaw Remediation
  • SC-7 Boundary Protection
Detect
Catch it (NIST detect / respond)
  • SC-5 Denial-of-service Protection
Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)

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Mitigating Controls (NIST 800-53 r5) AI

SC-5 Denial-of-service Protection good match
preventdetect

Directly counters the remote DoS condition caused by improper resource handling in smf_nsmf_handle_update_data_in_vsmf.

SI-2 Flaw Remediation good match
prevent

Requires timely remediation of the publicly disclosed flaw in Open5GS SMF before exploitation.

SC-7 Boundary Protection partial match
prevent

Boundary protection can restrict remote traffic reaching the vulnerable SMF nsmf-handler endpoint.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly include coding standards for correct resource allocation and release.

DE.CM-09 partial match
prevents

Runtime monitoring can detect resource exhaustion caused by improper shutdown or release.

ID.AM-08 partial match
prevents

Lifecycle management of assets can encompass proper resource release at end-of-life or shutdown.

PR.IR-04 partial match
prevents

Capacity management helps surface leaks from unreleased resources but does not prevent the coding flaw.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.37 Documented operating procedures partial match
prevents

Including restart, recovery and media-handling instructions reduces the likelihood that resources or sensitive data will be left in an exposed or improperly released state after a failure.

References