Vulnerability-Lookup

RHSA-2026:85135

Vulnerability from csaf_redhat - Published: 2026-10-19 12:58 - Updated: 2026-10-19 17:16

Summary

Red Hat Security Advisory: pcs security update

Severity

Important

Notes

Topic: An update for pcs is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On. Red Hat Product Security has rated this update as having a security impact of Important. 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: The pcs packages provide a command-line configuration system for the Pacemaker and Corosync utilities. 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) 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-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 ('HTTP Request/Response Smuggling')

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.src	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-snmp-0:0.10.12-6.el8_6.14.x86_64	—	Vendor Fix fix Workaround

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 3 products, the same list as for CVE-2024-14029

Threats

Impact Important

References

19 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:85135	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://security.access.redhat.com/data/csaf/v2/a…	self
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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          "category": "vendor_fix",
          "date": "2026-10-19T12:58:27+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",
          "product_ids": [
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.src",
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.x86_64",
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-snmp-0:0.10.12-6.el8_6.14.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:85135"
        },
        {
          "category": "workaround",
          "details": "Restrict request payload sizes or maximum form field counts at an upstream web application firewall (WAF) or reverse proxy layer before HTTP requests reach the Tornado application worker.",
          "product_ids": [
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.src",
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.x86_64",
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-snmp-0:0.10.12-6.el8_6.14.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.src",
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-0:0.10.12-6.el8_6.14.x86_64",
            "HighAvailability-8.6.0.Z.EUS.EXTENSION:pcs-snmp-0:0.10.12-6.el8_6.14.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "python-tornado: Tornado: Denial of Service via excessive URL-encoded body fields"
    }
  ]
}

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 6545 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

Show details on NVD website

JSON

To clipboard

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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 7646 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

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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-2026:85135

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

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

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour