a2aproject a2a-go REST SSE handler rest.go resource consumption

{
  "id": "bfb621c66ac120775de2b370265b84e19362caab964d78275605ff1a9472842c",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-117503",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "a2aproject a2a-go REST SSE handler rest.go resource consumption",
    "summary": "A vulnerability was determined in a2aproject a2a-go up to 2.4.0. Impacted is an unknown function of the file a2asrv/rest.go of the component REST SSE handler. This manipulation causes resource consumption. It is possible to initiate the attack remotely. Upgrading to version 2.5.0 is recommended to address this issue. Patch name: ff6035bd21e44bb3ee1bfa547885b8c08327fa01. It is recommended to upgrade the affected component.",
    "evidence": "cve:CVE-2026-117503",
    "products": [
      {
        "name": {
          "value": "a2a-go",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-117503",
      "aliases": [
        "CVE-2026-117503"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X"
          }
        },
        {
          "cvssV3_1": {
            "version": "3.1",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C"
          }
        },
        {
          "cvssV3_0": {
            "version": "3.0",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C"
          }
        },
        {
          "cvssV2_0": {
            "version": "2.0",
            "baseScore": 5,
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C"
          }
        }
      ],
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:a2aproject:a2a-go:*:*:*:*:*:*:*:*"
          ],
          "vendor": "a2aproject",
          "modules": [
            "REST SSE handler"
          ],
          "product": "a2a-go",
          "versions": [
            {
              "status": "affected",
              "version": "2.0"
            },
            {
              "status": "affected",
              "version": "2.1"
            },
            {
              "status": "affected",
              "version": "2.2"
            },
            {
              "status": "affected",
              "version": "2.3"
            },
            {
              "status": "affected",
              "version": "2.4.0"
            },
            {
              "status": "unaffected",
              "version": "2.5.0"
            }
          ]
        }
      ],
      "modified": "2026-10-27T13:45:17.953Z",
      "provider": "cve",
      "references": [
        "https://vuldb.com/vuln/427070",
        "https://vuldb.com/vuln/427070/cti",
        "https://vuldb.com/cve/CVE-2026-117503",
        "https://vuldb.com/submit/1015052",
        "https://github.com/a2aproject/a2a-go/pull/396",
        "https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01",
        "https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0",
        "https://github.com/a2aproject/a2a-go/"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
          "shortName": "VulDB",
          "dateUpdated": "2026-10-27T13:45:17.953Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-117503",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 392700,
  "published_at": "2026-10-27T13:45:17.953+00:00"
}