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Advisory record · GHSA-w6rq-6h34-vh7q

Cached redirect poisoning via X-Forwarded-Host header

CVSS 7.0 HighEPSS 0.0086 · 58th percentile

Published by the GitHub Advisory Database at 1 Jul 2021, 17:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.ratpack:ratpack-coreMaven<1.9.01.9.0
Identifiers
GHSA-w6rq-6h34-vh7q · CVE-2021-29479
Weakness (CWE)
CWE-807
Tags
Published
1 Jul 2021
Updated
8 Jul 2026

Machine-written summary

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

Ratpack Core (io.ratpack:ratpack-core) versions before 1.9.0 are vulnerable to cached redirect poisoning through the X-Forwarded-Host header when a cache in front of the server does not include that header in its cache key and no custom PublicAddress is configured. An attacker who can send requests through the cache can cause a cached redirect to point to their own site. Upgrade to version 1.9.0 or later. As a workaround, configure a custom PublicAddress using ServerConfigBuilder.publicAddress.

Written 2 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
7.0 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0086, the 58th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 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.