CVE-2026-117503 (GCVE-0-2026-117503)

Vulnerability from cvelistv5 – Published: 2026-10-27 13:45 – Updated: 2026-10-27 13:45 X_Open Source
VLAI
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.
Severity
6.9 (Medium)
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
5.3 (Medium)
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
5.3 (Medium)
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
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3865 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
a2aproject a2a-go Affected: 2.0
Affected: 2.1
Affected: 2.2
Affected: 2.3
Affected: 2.4.0
Unaffected: 2.5.0
    cpe:2.3:a:a2aproject:a2a-go:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
colorfullbz (VulDB User)
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:a2aproject:a2a-go:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "REST SSE handler"
          ],
          "product": "a2a-go",
          "vendor": "a2aproject",
          "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"
            },
            {
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            }
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        }
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      "credits": [
        {
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          "type": "reporter",
          "value": "colorfullbz (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
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            "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",
            "version": "4.0"
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            "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",
            "version": "3.1"
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            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C",
            "version": "2.0"
          }
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      "problemTypes": [
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          "descriptions": [
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              "description": "Resource Consumption",
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              "description": "Denial of Service",
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      "providerMetadata": {
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        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
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      "references": [
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          "name": "VDB-427070 | a2aproject a2a-go REST SSE handler rest.go resource consumption",
          "tags": [
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        },
        {
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          "tags": [
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          "url": "https://vuldb.com/vuln/427070/cti"
        },
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          "name": "CVE-2026-117503 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-117503"
        },
        {
          "name": "Submit #1015052 | a2aproject a2a-go \u2264 v2.4.0 CWE-400",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/1015052"
        },
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          "tags": [
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          "url": "https://github.com/a2aproject/a2a-go/pull/396"
        },
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          "tags": [
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          "url": "https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01"
        },
        {
          "tags": [
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          "url": "https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0"
        },
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          "tags": [
            "product"
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          "url": "https://github.com/a2aproject/a2a-go/"
        }
      ],
      "tags": [
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          "time": "2026-10-27T00:00:00.000Z",
          "value": "Advisory disclosed"
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          "time": "2026-10-27T01:00:00.000Z",
          "value": "VulDB entry created"
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          "lang": "en",
          "time": "2026-10-27T09:52:42.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "a2aproject a2a-go REST SSE handler rest.go resource consumption",
      "x_generator": [
        "VulDB PVTS v202610"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-117503",
    "datePublished": "2026-10-27T13:45:17.953Z",
    "dateReserved": "2026-10-27T08:47:20.319Z",
    "dateUpdated": "2026-10-27T13:45:17.953Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-117503",
      "date": "2026-10-28",
      "epss": "0.0071",
      "percentile": "0.53382"
    },
    "nvd": {
      "cve": {
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            "affectedData": [
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                  "cpe:2.3:a:a2aproject:a2a-go:*:*:*:*:*:*:*:*"
                ],
                "modules": [
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                ],
                "product": "a2a-go",
                "vendor": "a2aproject",
                "versions": [
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                    "version": "2.1"
                  },
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                    "status": "affected",
                    "version": "2.3"
                  },
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            "source": "cna@vuldb.com"
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        "cveTags": [],
        "descriptions": [
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            "lang": "en",
            "value": "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."
          }
        ],
        "id": "CVE-2026-117503",
        "lastModified": "2026-10-27T14:52:13.410",
        "metrics": {
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                "integrityImpact": "NONE",
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                "version": "2.0"
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              "obtainAllPrivilege": false,
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          "cvssMetricV40": [
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                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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                "modifiedSubIntegrityImpact": "NOT_DEFINED",
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                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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                "privilegesRequired": "NONE",
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                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
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                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
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        "vulnStatus": "Deferred",
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    }
  }
}



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