Vulnerability-Lookup

RHSA-2026:98104

Vulnerability from csaf_redhat - Published: 2026-11-11 01:44 - Updated: 2026-11-11 11:20

Summary

Red Hat Security Advisory: python-tornado security update

Severity

Critical

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 Critical. 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): * python-tornado: Tornado: Denial of Service via excessive URL-encoded body fields (CVE-2026-82397) * python-tornado: Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding (CVE-2024-14029) * python-tornado: Tornado before 6.3.3 HTTP Request Smuggling via Content-Length (CVE-2023-54397) 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-2023-54397

A flaw was found in Tornado's HTTP request header parsing logic. When processing incoming HTTP requests, Tornado fails to reject malformed Content-Length headers containing non-standard characters. An unauthenticated remote attacker can exploit this parsing discrepancy when Tornado is deployed behind a front-end proxy or load balancer to cause a request boundary mismatch. This allows the attacker to conduct HTTP request smuggling, bypass proxy-level security controls, and inject unauthorized requests directly into the backend application context.

7.5 (High)


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

CWE-444 - Inconsistent Interpretation of HTTP Requests

Affected products

Fixed 9 products

Product	Version	Remediation
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.4.ppc64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.4.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.4.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.4.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-0:4.2.1-5.el7_9.4.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.4.ppc64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.4.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.4.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-debuginfo-0:4.2.1-5.el7_9.4.x86_64	—	Vendor Fix fix Workaround

Known not affected 4 products

Product	Version	Remediation
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.4.ppc64	—	Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.4.ppc64le	—	Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.4.s390x	—	Workaround
Unresolved product id: 7Server-optional-ELS:python-tornado-doc-0:4.2.1-5.el7_9.4.x86_64	—	Workaround

Threats

Impact Critical

CVE-2024-14029

A vulnerability was discovered in Tornado where it improperly handles HTTP requests containing duplicate Transfer-Encoding: chunked headers. When duplicate Transfer-Encoding headers are present in an incoming request, Tornado ignores them and treats the request as body-less, leaving the chunked message body unparsed in the HTTP socket stream. When Tornado is deployed behind a reverse proxy or load balancer that correctly processes chunked payloads, an unauthenticated remote attacker can exploit this parsing discrepancy to conduct HTTP request smuggling, bypass proxy security restrictions, poison intermediate caches, or desynchronize backend connections.

7.5 (High)


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

CWE-444 - Inconsistent Interpretation of HTTP Requests

Affected products

Fixed 9 products, the same list as for CVE-2023-54397

Known not affected 4 products, the same list as for CVE-2023-54397

Threats

Impact Important

CVE-2026-82397

A flaw was found in Tornado. An unauthenticated remote attacker could send a specially crafted request with a large number of fields in the URL-encoded body. This could cause the single-threaded event loop to stall, leading to a Denial of Service (DoS) for all connections. The vulnerability occurs because the urllib.parse.parse_qs function is used without limiting the maximum number of fields.

7.5 (High)


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

CWE-1050 - Excessive Platform Resource Consumption within a Loop

Affected products

Fixed 9 products, the same list as for CVE-2023-54397

Known not affected 4 products, the same list as for CVE-2023-54397

Threats

Impact Important

References

26 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:98104	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526562	external
https://bugzilla.redhat.com/show_bug.cgi?id=2533918	external
https://bugzilla.redhat.com/show_bug.cgi?id=2533932	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2023-54397	self
https://bugzilla.redhat.com/show_bug.cgi?id=2533932	external
https://www.cve.org/CVERecord?id=CVE-2023-54397	external
https://nvd.nist.gov/vuln/detail/CVE-2023-54397	external
https://github.com/tornadoweb/tornado/security/ad…	external
https://www.vulncheck.com/advisories/tornado-befo…	external
https://access.redhat.com/security/cve/CVE-2024-14029	self
https://bugzilla.redhat.com/show_bug.cgi?id=2533918	external
https://www.cve.org/CVERecord?id=CVE-2024-14029	external
https://nvd.nist.gov/vuln/detail/CVE-2024-14029	external
https://github.com/tornadoweb/tornado/security/ad…	external
https://www.vulncheck.com/advisories/tornado-befo…	external
https://access.redhat.com/security/cve/CVE-2026-82397	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526562	external
https://www.cve.org/CVERecord?id=CVE-2026-82397	external
https://nvd.nist.gov/vuln/detail/CVE-2026-82397	external
https://github.com/tornadoweb/tornado/commit/8d63…	external
https://github.com/tornadoweb/tornado/pull/3704	external
https://github.com/tornadoweb/tornado/releases/ta…	external
https://github.com/tornadoweb/tornado/security/ad…	external

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            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N",
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          "details": "Important"
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      "title": "python-tornado: Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding"
    },
    {
      "cve": "CVE-2026-82397",
      "cwe": {
        "id": "CWE-1050",
        "name": "Excessive Platform Resource Consumption within a Loop"
      },
      "discovery_date": "2026-08-31T21:40:51.208627+00:00",
      "flags": [
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          "label": "vulnerable_code_not_present",
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      ],
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          "title": "Vulnerability description"
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          "category": "summary",
          "text": "python-tornado: Tornado: Denial of Service via excessive URL-encoded body fields",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw was found in Tornado\u0027s request body parsing mechanism. When processing application/x-www-form-urlencoded HTTP request bodies, Tornado invokes urllib.parse.parse_qs without specifying max_num_fields. An unauthenticated remote attacker can send an HTTP request with an excessively large number of form field key-value pairs. Parsing these fields synchronously blocks Tornado\u0027s single-threaded event loop, leading to a complete denial of service for all concurrent connections and incoming requests.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-82397"
        },
        {
          "category": "external",
          "summary": "RHBZ#2526562",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526562"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-82397",
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-82397",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82397"
        },
        {
          "category": "external",
          "summary": "https://github.com/tornadoweb/tornado/commit/8d6363ed7b69d5f0da806efe34d256627a2191de",
          "url": "https://github.com/tornadoweb/tornado/commit/8d6363ed7b69d5f0da806efe34d256627a2191de"
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          "category": "external",
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          "category": "vendor_fix",
          "date": "2026-11-11T01:44:54+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
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          "category": "workaround",
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  ]
}

CVE-2023-54397 (GCVE-0-2023-54397)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:17 – Updated: 2026-09-17 14:48

Title

Tornado before 6.3.3 HTTP Request Smuggling via Content-Length

Summary

Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with these characters to bypass proxy validation and smuggle requests when deployed behind certain proxies.

Severity

9 (Critical)


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

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 14:48 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7812 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…	vendor-advisory
https://www.vulncheck.com/advisories/tornado-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
tornadoweb	tornado	Affected: 0 , < 6.3.3 (semver) Unaffected: 6.3.3 (semver) cpe:2.3:a:tornadoweb:tornado::::::::

Date Public

2023-08-12 00:00

Credits

kenballus

Show details on NVD website

JSON

To clipboard

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CVE-2024-14029 (GCVE-0-2024-14029)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:17 – Updated: 2026-09-15 17:09

Title

Tornado before 6.4.1 HTTP Request Smuggling via Transfer-Encoding

Summary

Tornado before 6.4.1 ignores duplicate Transfer-Encoding: chunked headers, treating requests as having no message body and parsing the chunked body as a subsequent request. Attackers can exploit this inconsistency when Tornado is deployed behind proxies to perform HTTP request smuggling, enabling access control bypass, cache poisoning, or connection desynchronization.

Severity

9 (Critical)


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

7.5 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 17:07 UTC

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7812 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…	vendor-advisory
https://www.vulncheck.com/advisories/tornado-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
tornadoweb	tornado	Affected: 0 , < 6.4.1 (semver) Unaffected: 6.4.1 (semver) cpe:2.3:a:tornadoweb:tornado::::::::

Date Public

2024-06-06 00:00

Credits

kenballus

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CVE-2026-82397 (GCVE-0-2026-82397)

Vulnerability from cvelistv5 – Published: 2026-08-31 21:28 – Updated: 2026-09-02 17:39

Title

Tornado: Urlencoded body parsing omits max_num_fields, so one request can stall the event loop

Summary

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py, so an unauthenticated request body containing millions of separator-delimited fields can synchronously stall the single-threaded event loop and delay every connection. The body is bounded only by max_buffer_size, which defaults to 104857600 bytes. This issue is fixed in version 6.5.8.

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 2026-09-02 17:39 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7814 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…	x_refsource_CONFIRM
https://github.com/tornadoweb/tornado/pull/3704	x_refsource_MISC
https://github.com/tornadoweb/tornado/commit/8d63…	x_refsource_MISC
https://github.com/tornadoweb/tornado/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
tornadoweb	tornado	Affected: < 6.5.8

Show details on NVD website

JSON

To clipboard

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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-2026:98104

CVE-2023-54397 (GCVE-0-2023-54397)

CVE-2024-14029 (GCVE-0-2024-14029)

CVE-2026-82397 (GCVE-0-2026-82397)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour