CVE-2026-45182 PUBLISHED

Assigner: mitre
Reserved: 09.05.2026 Published: 09.05.2026 Updated: 09.05.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
CVSS Score: 2.2

Attack Vector	Local	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	None
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	GrapheneOS
Product	GrapheneOS
Versions	Default: unaffected affected from 0 to 2026050400 (excl.)

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/

Problem Types

CWE-441 Unintended Proxy or Intermediary ('Confused Deputy') CWE