PYSEC-2026-1860

Vulnerability from pysec - Published: 2026-07-07 14:34 - Updated: 2026-07-07 17:25
VLAI
Details

Applications using Werkzeug to parse multipart/form-data requests are vulnerable to resource exhaustion. A specially crafted form body can bypass the Request.max_form_memory_size setting.

The Request.max_content_length setting, as well as resource limits provided by deployment software and platforms, are also available to limit the resources used during a request. This vulnerability does not affect those settings. All three types of limits should be considered and set appropriately when deploying an application.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
Impacted products
Name purl
quart pkg:pypi/quart
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "quart",
        "purl": "pkg:pypi/quart"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.20.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.10.0",
        "0.11.0",
        "0.11.1",
        "0.11.2",
        "0.11.3",
        "0.11.4",
        "0.11.5",
        "0.12.0",
        "0.13.0",
        "0.13.1",
        "0.14.0",
        "0.14.1",
        "0.15.0",
        "0.15.1",
        "0.16.0",
        "0.16.1",
        "0.16.2",
        "0.16.3",
        "0.17.0",
        "0.18.0",
        "0.18.1",
        "0.18.2",
        "0.18.3",
        "0.18.4",
        "0.19.0",
        "0.19.1",
        "0.19.2",
        "0.19.3",
        "0.19.4",
        "0.19.5",
        "0.19.6",
        "0.19.7",
        "0.19.8",
        "0.19.9",
        "0.2.0",
        "0.3.0",
        "0.3.1",
        "0.4.0",
        "0.4.1",
        "0.5.0",
        "0.6.0",
        "0.6.1",
        "0.6.10",
        "0.6.11",
        "0.6.12",
        "0.6.13",
        "0.6.14",
        "0.6.15",
        "0.6.2",
        "0.6.3",
        "0.6.4",
        "0.6.5",
        "0.6.6",
        "0.6.7",
        "0.6.8",
        "0.6.9",
        "0.7.0",
        "0.7.1",
        "0.7.2",
        "0.8.0",
        "0.8.1",
        "0.9.0",
        "0.9.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2024-49767",
    "GHSA-q34m-jh98-gwm2"
  ],
  "details": "Applications using Werkzeug to parse `multipart/form-data` requests are vulnerable to resource exhaustion. A specially crafted form body can bypass the `Request.max_form_memory_size` setting.\n\n\nThe `Request.max_content_length` setting, as well as resource limits provided by deployment software and platforms, are also available to limit the resources used during a request. This vulnerability does not affect those settings. All three types of limits should be considered and set appropriately when deploying an application.",
  "id": "PYSEC-2026-1860",
  "modified": "2026-07-07T17:25:15.646238Z",
  "published": "2026-07-07T14:34:43.453362Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-q34m-jh98-gwm2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-49767"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets/quart/commit/5e78c4169b8eb66b91ead3e62d44721b9e1644ee"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets/quart/commit/abb04a512496206de279225340ed022852fbf51f"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets/werkzeug/commit/50cfeebcb0727e18cc52ffbeb125f4a66551179b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pallets/werkzeug"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets/werkzeug/releases/tag/3.0.6"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20250103-0007"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/quart"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-q34m-jh98-gwm2"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Werkzeug possible resource exhaustion when parsing file data in forms"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.