# CVE-2026-1738: Open5GS SGWC context.c sgwc_tunnel_add assertion

> Remote attackers can trigger a reachable assertion in Open5GS SGWC, causing a denial of service.

- **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:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Feb 2026
- **Updated:** 6 Mar 2026
- **Also known as:** GHSA-3242-rqgf-8x5v

## What is CVE-2026-1738?

CVE-2026-1738 is a medium-severity denial of service vulnerability in Open5gs Open5gs, published on 2 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A flaw has been found in Open5GS up to 2.7.6. The impacted element is the function sgwc_tunnel_add of the file /src/sgwc/context.c of the component SGWC. Executing a manipulation of the argument pdr can lead to reachable assertion. The attack can be executed remotely. The exploit has been published and may be used. It is advisable to implement a patch to correct this issue. The issue report is flagged as already-fixed.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2026-1738?

It affects 1 product.


Products: Open5gs Open5gs.

## How do I fix CVE-2026-1738?

No fix has been published for CVE-2026-1738 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1738 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1738 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-2026-1738 and fix it if it is affected.

What it is: CVE-2026-1738 is a medium-severity denial of service vulnerability in Open5gs Open5gs, published on 2 Feb 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-2026-1738 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-2026-1738/ (Markdown: https://insights.sbomify.com/CVE-2026-1738/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1738
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1738
- OSV: https://osv.dev/vulnerability/CVE-2026-1738

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1738/
Summaries are generated and may contain mistakes; the official description above is the record.