Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-qxp5-gwg8-xv66

HTTP Proxy bypass using IPv6 Zone IDs in golang.org/x/net

CVSS 4.4 MediumEPSS 0.0043 · 36th percentile

Published by the GitHub Advisory Database at 12 Mar 2025, 22:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
golang.org/x/netGo<0.36.00.36.0
Identifiers
GHSA-qxp5-gwg8-xv66 · CVE-2025-22870 · GO-2025-3503
Weakness (CWE)
CWE-20 · CWE-115
Tags
Published
12 Mar 2025
Updated
10 Sept 2026

Machine-written summary

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

The golang.org/x/net package is vulnerable in versions before 0.36.0. When hosts are matched against proxy patterns, an IPv6 zone ID can be wrongly treated as part of the hostname, so a request can skip the proxy it should have used. An attacker who can make requests through the affected code could cause traffic to bypass the configured proxy. Upgrade to golang.org/x/net 0.36.0 or later.

Written 1 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

ScoreRatingCVSSVectorSource
4.4 Medium 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0043, the 36th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:15 UTC First seen by agentprime
  2. 31 Oct 2026, 14:15 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.