A2A Java SDK has a fail-open default task authorization

{
  "id": "b6f82b0e7b78528596d023a164a596958f324df82cea96698726d27caf824d3e",
  "url": "https://osv.dev/vulnerability/GHSA-qw47-mcm5-934w",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "A2A Java SDK has a fail-open default task authorization",
    "summary": "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: ```java public InMemoryTaskStore() { this.authorizationProvider = null; // default wiring } @Override public @Nullable Task get(String taskId) { return tasks.get(taskId); // no owner / caller check } ``` Authorization is enforced only when the application both supplies a `TaskAuthorizationProvider` *and* routes requests through `AuthorizationRequestHandlerDecorator` (via CDI), which checks ownership before delegating. A server that uses the default store, or wires `DefaultRequestHandler.builder().build()` manually, or integ",
    "evidence": "osv:GHSA-qw47-mcm5-934w",
    "products": [
      {
        "name": {
          "value": "org.a2aproject.sdk:a2a-java-sdk-server-common",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.3.0.Final",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.0.0.Alpha4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0.Beta1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0.CR1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.0.0.Final",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.1.0.Final",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.2.0.Final",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-qw47-mcm5-934w",
      "aliases": [
        "CVE-2026-111764",
        "GHSA-qw47-mcm5-934w"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.3.0.Final"
                }
              ]
            }
          ],
          "package": {
            "name": "org.a2aproject.sdk:a2a-java-sdk-server-common",
            "purl": "pkg:maven/org.a2aproject.sdk/a2a-java-sdk-server-common",
            "ecosystem": "Maven"
          },
          "versions": [
            "1.0.0.Alpha4",
            "1.0.0.Beta1",
            "1.0.0.CR1",
            "1.0.0.Final",
            "1.1.0.Final",
            "1.2.0.Final"
          ],
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-qw47-mcm5-934w/GHSA-qw47-mcm5-934w.json"
          }
        }
      ],
      "modified": "2026-10-20T21:15:04.046382128Z",
      "provider": "osv",
      "references": [
        "https://github.com/a2aproject/a2a-java/security/advisories/GHSA-qw47-mcm5-934w",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111764",
        "https://github.com/a2aproject/a2a-java/pull/1095",
        "https://github.com/a2aproject/a2a-java/commit/efb4e985e99390c4fc1f78c0a187a4254c0a2553",
        "https://github.com/a2aproject/a2a-java",
        "https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1188",
          "CWE-862"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-10-20T16:17:00Z",
        "github_reviewed_at": "2026-10-20T21:05:09Z"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111764",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 390708,
  "published_at": "2026-10-20T21:05:09+00:00"
}