A2A Java SDK has a fail-open default task authorization

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2026-111764: 0.60% estimated exploitation activity in the next 30 days; percentile 48.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Draft text for GHSA-qw47-mcm5-934w. The body below drops into the GitHub advisory description field; the metadata block maps to the form fields. Set the patched version at release; publish when the fix ships. --- - Ecosystem: Maven - Affected package: org.a2aproject.sdk:a2a-java-sdk-server-common (task store / authorization) - Affected versions: <= 1.2.0.Final (and 1.2.1.Final-SNAPSHOT on main prior to the fix) - Patched version: (the release that carries the fix, e.g. 1.2.1.Final) - CWE: CWE-1188 (Insecure Default Initialization), CWE-862 (Missing Authorization) - Severity: High - CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (7.5, High) --- Details The default task store performs no authorization on task reads. InMemoryTaskStore's no-arg constructor sets authorizationProvider = null, and InMemoryTaskStore.get(String taskId) is a bare map lookup with no authorization check regardless of provider: Authorization is enforced only when the application both supplies a…

Published by the source

20 Oct 2026, 21:05 UTC

Last modified by the source

20 Oct 2026, 21:15 UTC

Source last checked

26 Oct 2026, 16:58 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-qw47-mcm5-934w

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-qw47-mcm5-934w

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# Patch Next advisory brief: CVE-2026-111764

Advisory: A2A Java SDK has a fail-open default task authorization
IDs: CVE-2026-111764, GHSA-qw47-mcm5-934w
Record: https://patchnext.com/advisories/cve-2026-111764 (revision 2, source checked 26 Oct 2026, 16:58 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.a2aproject.sdk:a2a-java-sdk-server-common 1.3.0.Final. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.a2aproject.sdk:a2a-java-sdk-server-common: affected < 1.3.0.Final; fixed in 1.3.0.Final

## Suggested inspection (read-only)
- Maven org.a2aproject.sdk:a2a-java-sdk-server-common: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.a2aproject.sdk:a2a-java-sdk-server-common.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-qw47-mcm5-934w (OSV record GHSA-qw47-mcm5-934w lists affected ranges: Maven org.a2aproject.sdk:a2a-java-sdk-server-common >=0 <1.3.0.Final (fixed))
- Verified: https://github.com/advisories/GHSA-qw47-mcm5-934w (GitHub-reviewed advisory GHSA-qw47-mcm5-934w lists affected ranges: Maven org.a2aproject.sdk:a2a-java-sdk-server-common >=0 <1.3.0.Final)

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