CVE-2026-116127

Full vulnerability record from the local CVENow database.

Description

Starlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next response on a persistent or pipelined connection. The request method is not passed to the response writer, so whatever body the application returns for a HEAD request is sent. With Plack::Middleware::Head the body is empty, but an HTTP/1.1 response without a Content-Length header still gets the chunked encoding terminator. Responses with status 204 or 304 are also sent with their body. Pipelined GET and HEAD requests keep the connection open even when keep-alive is disabled, which is the default. A client or proxy reading the connection takes the extra bytes as the start of the next response, which may desynchronize a proxy that shares the connection across clients.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

9b29abf9-4ab0-4765-b253-1875cd9b441e

Published

2026-10-30 13:18:31.180000

Last modified

2026-10-30 13:18:31.180000

View original CVE JSON

{
  "id": "CVE-2026-116127",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-10-30T13:18:31.180",
  "lastModified": "2026-10-30T13:18:31.180",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Starlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next response on a persistent or pipelined connection.\n\nThe request method is not passed to the response writer, so whatever body the application returns for a HEAD request is sent. With Plack::Middleware::Head the body is empty, but an HTTP/1.1 response without a Content-Length header still gets the chunked encoding terminator. Responses with status 204 or 304 are also sent with their body.\n\nPipelined GET and HEAD requests keep the connection open even when keep-alive is disabled, which is the default. A client or proxy reading the connection takes the extra bytes as the start of the next response, which may desynchronize a proxy that shares the connection across clients."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "Starlet",
          "modules": [
            "Starlet"
          ],
          "programFiles": [
            "lib/Starlet/Server.pm"
          ],
          "programRoutines": [
            {
              "name": "Starlet::Server::_handle_response"
            },
            {
              "name": "Starlet::Server::handle_connection"
            }
          ],
          "repo": "https://github.com/kazuho/Starlet",
          "packageURL": "pkg:cpan/Starlet",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.33",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-444"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/kazuho/Starlet/commit/859e0c9572cdbed4bb45706d3957b3c025dc0ede.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://metacpan.org/release/KAZUHO/Starlet-0.33/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ]
}