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Advisory record · GHSA-fmxf-pm6p-7xgm

async-http-client: Cookie header not stripped on cross-origin redirect

CVSS 7.4 HighEPSS 0.0040 · 34th percentile

Published by the GitHub Advisory Database at 18 May 2026, 16:42 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.asynchttpclient:async-http-clientMaven>=3.0.0.Beta1, <3.0.10 || >=2.0.0, <2.15.03.0.10, 2.15.0
Identifiers
GHSA-fmxf-pm6p-7xgm · CVE-2026-45300
Weakness (CWE)
CWE-200
Tags
Published
18 May 2026
Updated
10 Sept 2026

Machine-written summary

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

Versions of org.asynchttpclient:async-http-client from 3.0.0.Beta1 before 3.0.10, and from 2.0.0 before 2.15.0, do not remove the Cookie header when following a redirect to a different origin or when the redirect downgrades from HTTPS to HTTP. An attacker who can supply a redirect target, such as through an open redirect, a compromised gateway, or a man-in-the-middle position on a plaintext hop, can receive session cookies and other cookie values. Upgrade to 3.0.10 or 2.15.0, which are the fixed versions.

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
7.4 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 34th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.