Is CVE-2026-8731 in the CISA KEV catalog?

No. CVE-2026-8731 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-8731?

CVE-2026-8731 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-8731?

CVE-2026-8731 has an EPSS score of 0.38% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-8731?

No published fix for CVE-2026-8731 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-8731

MEDIUM

4.3

CVSS v3

NVD

Description

A vulnerability has been found in Open5GS up to 2.7.7. Affected is the function ogs_sbi_client_add in the library /lib/sbi/client.c of the component NRF. The manipulation of the argument client_pool leads to denial of service. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CWE-404

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

0.38%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory2

VDB Entry1

vuldb.com

Product1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-18.