Vulnerability from bitnami_vulndb
Published
2025-12-05 11:13
Modified
2026-01-27 09:14
Summary
Excessive read buffering DoS in http.client
Details

When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "python",
        "purl": "pkg:bitnami/python"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.13.11"
            },
            {
              "introduced": "3.14.0"
            },
            {
              "fixed": "3.14.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-13836"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.",
  "id": "BIT-python-2025-13836",
  "modified": "2026-01-27T09:14:53.416Z",
  "published": "2025-12-05T11:13:05.077Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/issues/119451"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/pull/119454"
    },
    {
      "type": "WEB",
      "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13836"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587c"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Excessive read buffering DoS in http.client"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.