GHSA-vgrc-hq28-p3xp: github.com/apernet/hysteria/core/v2

Hysteria has an authenticated UDP ACL bypass that enables localhost and private-network UDP SSRF

CVSS 7.4 High

Published by the GitHub Advisory Database at 26 Jun 2026, 19:48 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
github.com/apernet/hysteria/core/v2	Go	>=2.0.0, <2.9.2	2.9.2

Identifiers

GHSA-vgrc-hq28-p3xp · GO-2026-5809

Weakness (CWE)

CWE-284 · CWE-918

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Hysteria (Go module github.com/apernet/hysteria/core/v2) versions 2.0.0 up to but not including 2.9.2 are affected. An authenticated client can open a UDP session to an allowed destination and then send packets within that session to destinations that the server's ACL rules deny, including localhost and private-network addresses, reaching UDP services the ACL was meant to block. Upgrade to version 2.9.2, which is listed as the fixed version.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.4	High	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 15:05 UTC First seen by agentprime
31 Oct 2026, 15:05 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.