Vulnerability-Lookup

RHSA-2026:24342

Vulnerability from csaf_redhat - Published: 2026-06-08 01:44 - Updated: 2026-11-12 17:09

Summary

Red Hat Security Advisory: python-tornado security update

Severity

Moderate

Notes

Topic: An update for python-tornado is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * tornado-python: Tornado: Denial of Service via large multipart bodies (CVE-2026-31958) * tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments (CVE-2026-35536) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-31958

A flaw was found in tornado-python. A remote attacker can exploit this vulnerability by sending a specially crafted, very large multipart body with numerous parts. Because the parsing of these large bodies occurs synchronously on the main thread, it can consume excessive resources, leading to a denial of service (DoS) for the application.

5.3 (Medium)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.3.ppc64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.3.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.3.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.3.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.3.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.3.ppc64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.3.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.3.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.3.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.3.ppc64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.3.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.3.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.3.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

CVE-2026-35536

A flaw was found in Tornado. A remote attacker could exploit this vulnerability by injecting specially crafted characters into the `domain`, `path`, and `samesite` arguments when setting cookies. This could lead to cookie attribute injection, potentially allowing for information disclosure or manipulation of client-side data.

5.4 (Medium)


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

CWE-88 - Improper Neutralization of Argument Delimiters in a Command

Affected products

Fixed 13 products, the same list as for CVE-2026-31958

Threats

Impact Moderate

References

16 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:24342	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2446765	external
https://bugzilla.redhat.com/show_bug.cgi?id=2454716	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-31958	self
https://bugzilla.redhat.com/show_bug.cgi?id=2446765	external
https://www.cve.org/CVERecord?id=CVE-2026-31958	external
https://nvd.nist.gov/vuln/detail/CVE-2026-31958	external
https://github.com/tornadoweb/tornado/security/ad…	external
https://access.redhat.com/security/cve/CVE-2026-35536	self
https://bugzilla.redhat.com/show_bug.cgi?id=2454716	external
https://www.cve.org/CVERecord?id=CVE-2026-35536	external
https://nvd.nist.gov/vuln/detail/CVE-2026-35536	external
https://github.com/tornadoweb/tornado/releases/ta…	external
https://github.com/tornadoweb/tornado/security/ad…	external

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          "title": "Vulnerability description"
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    {
      "cve": "CVE-2026-35536",
      "cwe": {
        "id": "CWE-88",
        "name": "Improper Neutralization of Argument Delimiters in a Command"
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      "discovery_date": "2026-04-03T04:00:50.793818+00:00",
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          "text": "A flaw was found in Tornado. A remote attacker could exploit this vulnerability by injecting specially crafted characters into the `domain`, `path`, and `samesite` arguments when setting cookies. This could lead to cookie attribute injection, potentially allowing for information disclosure or manipulation of client-side data.",
          "title": "Vulnerability description"
        },
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          "text": "tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments",
          "title": "Vulnerability summary"
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            "userInteraction": "REQUIRED",
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          "category": "impact",
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      "title": "tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments"
    }
  ]
}

CVE-2026-31958 (GCVE-0-2026-31958)

Vulnerability from cvelistv5 – Published: 2026-03-11 19:27 – Updated: 2026-04-01 14:32

Title

Tornado has a DoS due to too many multipart parts

Summary

Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-12 19:55 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7843 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…	x_refsource_CONFIRM
https://lists.debian.org/debian-lts-announce/2026…

Impacted products

1 product

Vendor	Product	Version
tornadoweb	tornado	Affected: < 6.5.5

Show details on NVD website

JSON

To clipboard

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                "timestamp": "2026-03-12T19:55:43.911671Z",
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          {
            "url": "https://lists.debian.org/debian-lts-announce/2026/04/msg00000.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "tornado",
          "vendor": "tornadoweb",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.5.5"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-11T19:27:23.380Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc"
        }
      ],
      "source": {
        "advisory": "GHSA-qjxf-f2mg-c6mc",
        "discovery": "UNKNOWN"
      },
      "title": "Tornado has a DoS due to too many multipart parts"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-31958",
    "datePublished": "2026-03-11T19:27:23.380Z",
    "dateReserved": "2026-03-10T15:40:10.481Z",
    "dateUpdated": "2026-04-01T14:32:33.146Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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CVE-2026-35536 (GCVE-0-2026-35536)

Vulnerability from cvelistv5 – Published: 2026-04-03 02:25 – Updated: 2026-04-03 13:12

Summary

In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters.

Severity

7.2 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-03 13:12 UTC

CWE

CWE-159 - Improper Handling of Invalid Use of Special Elements

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2132 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…
https://github.com/tornadoweb/tornado/releases/ta…

Impacted products

1 product

Vendor	Product	Version
tornadoweb	Tornado	Affected: 0 , < 6.5.5 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-35536",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-03T13:12:08.835726Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2026-04-03T13:12:16.105Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
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      "affected": [
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          "vendor": "tornadoweb",
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              "version": "0",
              "versionType": "semver"
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      ],
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          "value": "In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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            "version": "3.1"
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          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
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        },
        {
          "url": "https://github.com/tornadoweb/tornado/releases/tag/v6.5.5"
        }
      ],
      "x_generator": {
        "engine": "CVE-Request-form 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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    "dateReserved": "2026-04-03T02:25:57.035Z",
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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

RHSA-2026:24342

CVE-2026-31958 (GCVE-0-2026-31958)

CVE-2026-35536 (GCVE-0-2026-35536)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour