# CVE-2026-8186: Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out-of-bounds

> Remote attackers can trigger an out-of-bounds read in Open5GS NF client, potentially exposing memory or causing service disruption.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 May 2026
- **Updated:** 11 May 2026
- **Also known as:** GHSA-2xj3-jm9w-283r

## What is CVE-2026-8186?

CVE-2026-8186 is a medium-severity memory corruption vulnerability in Open5gs Open5gs, published on 9 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was detected in Open5GS up to 2.7.7. This affects the function ogs_sbi_client_send_via_scp_or_sepp in the library lib/sbi/client.c of the component NF. Performing a manipulation results in out-of-bounds read. The attack is possible to be carried out remotely. The patch is named d5bc487fcf9ea87d2b03f2ef95123af344773bfb. It is suggested to install a patch to address this issue.

Weakness: CWE-125 (Out-of-bounds Read), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-8186?

It affects 1 product.


Products: Open5gs Open5gs.

## How do I fix CVE-2026-8186?

No fix has been published for CVE-2026-8186 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8186 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8186 exists.

## Other vulnerabilities in Open5gs Open5gs

- [CVE-2024-40130](https://insights.sbomify.com/CVE-2024-40130/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-28122](https://insights.sbomify.com/CVE-2021-28122/): Missing authorization in n/a (critical 9.8)
- [CVE-2021-25863](https://insights.sbomify.com/CVE-2021-25863/): Hardcoded credentials in n/a (high 8.8)
- [CVE-2025-41067](https://insights.sbomify.com/CVE-2025-41067/): Reachable Assertion vulnerability in Open5GS (high 8.7)
- [CVE-2025-41068](https://insights.sbomify.com/CVE-2025-41068/): Reachable Assertion vulnerability in Open5GS (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8186 and fix it if it is affected.

What it is: CVE-2026-8186 is a medium-severity memory corruption vulnerability in Open5gs Open5gs, published on 9 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-8186 exists.

Affected product: Open5gs Open5gs. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-8186/ (Markdown: https://insights.sbomify.com/CVE-2026-8186/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8186
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8186
- OSV: https://osv.dev/vulnerability/CVE-2026-8186

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8186/
Summaries are generated and may contain mistakes; the official description above is the record.