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Advisory record · GHSA-pfc9-2cqg-9wq6

Reactor Netty HTTP Client Leaks Credentials On Protocol Downgrade Redirect

CVSS 6.1 MediumEPSS 0.0018 · 7th percentile

Published by the GitHub Advisory Database at 9 Jun 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.projectreactor.netty:reactor-nettyMaven>=1.3.0, <1.3.6 || >=1.2.0, <1.2.18 || >=1.1.0, <=1.1.31 || >=1.0.0, <=1.0.481.3.6, 1.2.18
Identifiers
GHSA-pfc9-2cqg-9wq6 · CVE-2026-41715
Weakness (CWE)
CWE-522
Tags
Published
9 Jun 2026
Updated
29 Jul 2026

Machine-written summary

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

Reactor Netty (io.projectreactor.netty:reactor-netty) versions 1.0.0 through 1.0.51, 1.1.0 through 1.1.35, 1.2.0 through 1.2.17, and 1.3.0 through 1.3.5 are affected. When the HTTP client is explicitly configured to follow redirects, a redirect from a secure endpoint to an insecure one can cause credentials to be leaked. Upgrade to version 1.3.6 or 1.2.18, or to a later release in your line.

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
6.1 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CNA (vmware)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 7th percentile, on 9 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.