GO-2026-5809 - Hysteria has an authenticated UDP ACL bypass that enables localhost and private-network UDP SSRF in…

Severity: info · Published 2026-07-07

Hysteria has an authenticated UDP ACL bypass that enables localhost and private-network UDP SSRF in github.com/apernet/hysteria/core

Technologies: github.com/apernet/hysteria/core/v2 (Go). Vendors: Go.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
Informational severity, published 7 July 2026.
Which products and versions are affected?
github.com/apernet/hysteria/core (Go) SEMVER:introduced=0; github.com/apernet/hysteria/core/v2 (Go) SEMVER:introduced=0,fixed=2.9.2.
Is there a fix for This vulnerability?
Yes. github.com/apernet/hysteria/core/v2 (Go): upgrade to 2.9.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected?
Check whether you run github.com/apernet/hysteria/core (Go) or github.com/apernet/hysteria/core/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/apernet/hysteria/core/v2 (Go): upgrade to 2.9.2 or later
    go get github.com/apernet/hysteria/core/v2@v2.9.2

Affected products

  • github.com/apernet/hysteria/core (Go) SEMVER:introduced=0
  • github.com/apernet/hysteria/core/v2 (Go) SEMVER:introduced=0,fixed=2.9.2

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