Cyber Resilience

CVE-2026-8123

Open5Gs ≤ 2.7.7

Public PoC
Published
08 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-2026-8123 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 SC-6 (Resource Availability) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

A vulnerability was determined in Open5GS up to 2.7.7. This impacts the function ogs_sbi_discovery_option_add_snssais in the library /lib/sbi/message.c of the component NSSF. This manipulation causes denial of service. It is possible to initiate the attack remotely. The exploit has been…

more

publicly disclosed and may be utilized. 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 exploitation of the DoS flaw in the NSSF component directly enables application/system denial of service via vulnerability exploitation.

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 resource handling flaw in NSSF directly enables application-layer DoS via crafted discovery requests.
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-2026-8290Same 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

Affected Assets

open5gs
open5gs
≤ 2.7.7

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SC-5 Denial-of-service Protection
  • SI-10 Information Input Validation
  • SC-6 Resource Availability
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

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

Directly implements protections against remote resource-exhaustion DoS in network functions such as NSSF.

SI-10 Information Input Validation partial match
prevent

Validates inputs to ogs_sbi_discovery_option_add_snssais to block malformed SNSSAI lists that trigger the CWE-404 leak.

SC-6 Resource Availability partial match
prevent

Limits resource allocation and availability for SBI message processing to contain exhaustion from the faulty discovery-option path.

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