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Advisory record · GHSA-9rhm-2h4x-jwmx

A2A Java SDK send client credentials under server-controlled HTTP header name, enabling leakage via redirect

CVSS 5.7 MediumEPSS 0.0014 · 3rd percentile

Published by the GitHub Advisory Database at 20 Oct 2026, 21:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.a2aproject.sdk:a2a-java-sdk-parentMaven<1.3.0.Final1.3.0.Final
Identifiers
GHSA-9rhm-2h4x-jwmx · CVE-2026-111763
Weakness (CWE)
CWE-522
Tags
Published
20 Oct 2026
Updated
21 Oct 2026

Machine-written summary

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

Versions of the A2A Java SDK parent package before 1.3.0.Final are affected. A malicious or compromised agent can supply an AgentCard that makes the client send its API key under a custom header name, and an HTTP redirect from that agent can then forward the header to a third-party server, leaking the credential. Upgrade to 1.3.0.Final or later. The source gives few details on other workarounds.

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
5.7 Medium 4.0 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0014, the 3rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.