CVE-2026-45182

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.

CVSS v3.1 Score

2.2

LOW

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

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.01%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-441 CWE-441

References

Other 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/

Frequently Asked Questions

What is CVE-2026-45182? +

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. It has a CVSS v3.1 base score of 2.2 (LOW).

How severe is CVE-2026-45182? +

CVE-2026-45182 has a CVSS v3.1 score of 2.2 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-45182? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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