CVE-2026-45182

Severity: low (CVSS 2.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-09 · updated 2026-07-24
Weakness: CWE-441

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.

Affected products

GrapheneOS: before 2026050400 — fixed in 2026050400

How to fix

Upgrade to a fixed version: GrapheneOS 2026050400. Check the vendor advisory for mitigations.

References

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

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