CVE-2026-78659 affecting package azcopy 10.25.1-9

{
  "id": "709a0de0ad524f792cc5bb89a8deba73165af93634945e0d4a93f1d5f190d4a8",
  "url": "https://osv.dev/vulnerability/AZL-107159",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-78659 affecting package azcopy 10.25.1-9",
    "summary": "When \"Trailer\" headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a \"Trailer\" header that declares a large number of fields, causing the server to allocate a disproportionate amount of memory while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits. This exploit is not applicable for HTTP/1 servers, which do not support multiplexing a large number of requests over one TCP connection, and whose Server.MaxHeaderBytes are calculated differently.",
    "evidence": "osv:AZL-107159",
    "products": [
      {
        "name": {
          "value": "azcopy",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "AZL-107159",
      "aliases": [
        "AZL-107159"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "10.25.1-9"
                }
              ]
            }
          ],
          "package": {
            "name": "azcopy",
            "purl": "pkg:rpm/azure-linux/azcopy",
            "ecosystem": "Azure Linux:3"
          },
          "database_specific": {
            "source": "https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-107159.json"
          }
        }
      ],
      "modified": "2026-10-15T05:37:09Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-78659"
      ],
      "references": [
        "https://nvd.nist.gov/vuln/detail/CVE-2026-78659"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-78659",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 321458,
  "published_at": "2026-10-08T23:17:03+00:00"
}