Vulnerability-Lookup

CVE-2025-67726 (GCVE-0-2025-67726)

Vulnerability from cvelistv5 – Published: 2025-12-12 06:13 – Updated: 2025-12-18 18:48

Title

Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters

Summary

Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period. This issue is fixed in version 6.5.3.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-18 18:47 UTC

CWE

CWE-834 - Excessive Iteration
CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…	x_refsource_CONFIRM
https://github.com/tornadoweb/tornado/commit/7714…	x_refsource_MISC
https://github.com/tornadoweb/tornado/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
tornadoweb	tornado	Affected: < 6.5.3	guessed

Show details on NVD website

JSON

To clipboard

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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-67726",
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        }
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        {
          "name": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-jhmp-mqwm-3gq8",
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        "advisory": "GHSA-jhmp-mqwm-3gq8",
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      "title": "Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters"
    }
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    "redhat_vex": {
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      "cve": "CVE-2025-67726",
      "id": "CVE-2025-67726",
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      "product_status:fixed": "134",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "398",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "tornado: Tornado Quadratic DoS via Crafted Multipart Parameters",
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    },
    "suse_vex": {
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-67726",
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      "version": "23"
    },
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OPENSUSE-SU-2026:20412-1

Vulnerability from csaf_opensuse - Published: 2026-03-24 06:24 - Updated: 2026-09-16 21:34

Summary

Security update for salt

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 55 products

Open the full advisory

RHSA-2026:0930

Vulnerability from csaf_opensuse - Published: 2026-01-21 00:00 - Updated: 2026-09-15 16:05

Summary

security update for pcs

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 2 products

Open the full advisory

PYSEC-2025-267

Vulnerability from pysec - Published: 2025-12-12 07:15 - Updated: 2026-07-13 05:52

Details

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impacted products

Name	purl
tornado	pkg:pypi/tornado

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "tornado",
        "purl": "pkg:pypi/tornado"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.5.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.2",
        "1.0",
        "1.1",
        "1.1.1",
        "1.2",
        "1.2.1",
        "2.0",
        "2.1",
        "2.1.1",
        "2.2",
        "2.2.1",
        "2.3",
        "2.4",
        "2.4.1",
        "3.0",
        "3.0.1",
        "3.0.2",
        "3.1",
        "3.1.1",
        "3.2",
        "3.2.1",
        "3.2.2",
        "4.0",
        "4.0.1",
        "4.0.2",
        "4.1",
        "4.1b2",
        "4.2",
        "4.2.1",
        "4.2b1",
        "4.3",
        "4.3b1",
        "4.3b2",
        "4.4",
        "4.4.1",
        "4.4.2",
        "4.4.3",
        "4.4b1",
        "4.5",
        "4.5.1",
        "4.5.2",
        "4.5.3",
        "4.5b1",
        "4.5b2",
        "5.0",
        "5.0.1",
        "5.0.2",
        "5.0a1",
        "5.0b1",
        "5.1",
        "5.1.1",
        "5.1b1",
        "6.0",
        "6.0.1",
        "6.0.2",
        "6.0.3",
        "6.0.4",
        "6.0a1",
        "6.0b1",
        "6.1",
        "6.1b1",
        "6.1b2",
        "6.2",
        "6.2b1",
        "6.2b2",
        "6.3",
        "6.3.1",
        "6.3.2",
        "6.3.3",
        "6.3b1",
        "6.4",
        "6.4.1",
        "6.4.2",
        "6.4b1",
        "6.5",
        "6.5.1",
        "6.5.2",
        "6.5b1"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-67726",
    "GHSA-jhmp-mqwm-3gq8"
  ],
  "details": "Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server\u0027s CPU usage increases quadratically (O(n\u00b2)) during parsing. Due to Tornado\u0027s single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period. This issue is fixed in version 6.5.3.",
  "id": "PYSEC-2025-267",
  "modified": "2026-07-13T05:52:14.026213Z",
  "published": "2025-12-12T07:15:44.920Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/tornadoweb/tornado/releases/tag/v6.5.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-jhmp-mqwm-3gq8"
    },
    {
      "type": "FIX",
      "url": "https://github.com/tornadoweb/tornado/commit/771472cfdaeebc0d89a9cc46e249f8891a6b29cd"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

RHSA-2026:2106

Vulnerability from csaf_redhat - Published: 2026-02-05 13:38 - Updated: 2026-09-17 02:32

Summary

Red Hat Security Advisory: RHOAI 2.25.2 - Red Hat OpenShift AI

Severity

Important

Scope

15 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

A denial of service flaw has been discovered in the Tornado networking library. Affected versions of Tornado us an inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a Content-Disposition header, the server's CPU usage increases quadratically (O(n²)) during parsing. Due to Tornado's single event loop architecture, a single malicious request can cause the entire server to become unresponsive for an extended period.

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 39 products Known not affected: 169 products

https://access.redhat.com/errata/RHSA-2026:2106

Open the full advisory

RHSA-2026:2462

Vulnerability from csaf_redhat - Published: 2026-02-10 17:54 - Updated: 2026-09-09 16:08

Summary

Red Hat Security Advisory: pcs security update

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 6 products

https://access.redhat.com/errata/RHSA-2026:2462

Open the full advisory

RHSA-2026:2465

Vulnerability from csaf_redhat - Published: 2026-02-10 18:26 - Updated: 2026-09-09 16:08

Summary

Red Hat Security Advisory: pcs security update

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 8 products

https://access.redhat.com/errata/RHSA-2026:2465

Open the full advisory

RHSA-2026:2469

Vulnerability from csaf_redhat - Published: 2026-02-10 19:17 - Updated: 2026-09-09 16:08

Summary

Red Hat Security Advisory: pcs security update

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 8 products

https://access.redhat.com/errata/RHSA-2026:2469

Open the full advisory

RHSA-2026:2484

Vulnerability from csaf_redhat - Published: 2026-02-10 20:17 - Updated: 2026-09-09 16:08

Summary

Red Hat Security Advisory: pcs security update

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 16 products

https://access.redhat.com/errata/RHSA-2026:2484

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RHSA-2026:3713

Vulnerability from csaf_redhat - Published: 2026-03-04 07:18 - Updated: 2026-09-17 02:32

Summary

Red Hat Security Advisory: RHOAI 3.3 - Red Hat OpenShift AI

Severity

Critical

Scope

46 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Fixed: 41 products Known not affected: 192 products

https://access.redhat.com/errata/RHSA-2026:3713

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SUSE-EL-9-CLIENT-TOOLS-2026-1026

Vulnerability from csaf_suse - Published: 2026-03-25 10:15 - Updated: 2026-09-16 18:55

Summary

Security update 5.0.7 for Multi-Linux Manager Salt Bundle

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2025-67726.

CVE-2025-67726

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Recommended: 4 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2025-67726 (GCVE-0-2025-67726)

Tags

Sightings

Nomenclature

Related by attack behaviour