Vulnerability-Lookup

SUSE-SU-2026:24121-1

Vulnerability from csaf_suse - Published: 2026-10-08 10:43 - Updated: 2026-10-15 17:14

Summary

Security update for python-tornado6

Severity

Important

Notes

Title of the patch: Security update for python-tornado6

Description of the patch: This update for python-tornado6 fixes the following issues: - CVE-2026-82397: an unauthenticated request body containing millions of separator-delimited fields can synchronously stall the single-threaded event loop and delay every connection (bsc#1277725). - CVE-2026-91990: splitting of multipart data before validation of the `max_parts` limit allows for resource exhaustion and a denial of service (bsc#1281439). - CVE-2026-91991: incomplete fix for cookie attribute injection allows for cookie validation bypass via semicolon- delimited data in capitalized parameters (bsc#1281440).

Patchnames: SUSE-SL-Micro-6.2-1872

CVE-2026-82397

7.5 (High)


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

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.2:python313-tornado6-0:6.5-160000.7.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.2:python313-tornado6-0:6.5-160000.7.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.2:python313-tornado6-0:6.5-160000.7.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.2:python313-tornado6-0:6.5-160000.7.1.x86_64	—	Vendor Fix

Threats

Impact important

CVE-2026-91990

7.5 (High)


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

Affected products

Recommended 4 products, the same list as for CVE-2026-82397

Threats

Impact important

CVE-2026-91991

7.2 (High)


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

Affected products

Recommended 4 products, the same list as for CVE-2026-82397

Threats

Impact important

References

17 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://www.suse.com/support/update/announcement/…	self
https://bugzilla.suse.com/1261922	self
https://bugzilla.suse.com/1277725	self
https://bugzilla.suse.com/1281439	self
https://bugzilla.suse.com/1281440	self
https://www.suse.com/security/cve/CVE-2026-82397/	self
https://www.suse.com/security/cve/CVE-2026-91990/	self
https://www.suse.com/security/cve/CVE-2026-91991/	self
https://www.suse.com/security/cve/CVE-2026-82397	external
https://bugzilla.suse.com/1277725	external
https://www.suse.com/security/cve/CVE-2026-91990	external
https://bugzilla.suse.com/1281439	external
https://www.suse.com/security/cve/CVE-2026-91991	external
https://bugzilla.suse.com/1281440	external

JSON

To clipboard

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            "SUSE Linux Micro 6.2:python313-tornado6-0:6.5-160000.7.1.s390x",
            "SUSE Linux Micro 6.2:python313-tornado6-0:6.5-160000.7.1.x86_64"
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        }
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      ],
      "title": "CVE-2026-91991"
    }
  ]
}

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 7737 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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CVE-2026-91990 (GCVE-0-2026-91990)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 16:05

Title

Tornado before 6.5.8 Memory Amplification DoS via multipart

Summary

Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.

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

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 16:04 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6398 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 , < 6.5.8 (semver) Unaffected: 6.5.8 (semver) cpe:2.3:a:tornadoweb:tornado::::::::

Date Public

2026-08-07 00:00

Show details on NVD website

JSON

To clipboard

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CVE-2026-91991 (GCVE-0-2026-91991)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-10-08 15:26

Title

Tornado before 6.5.8 Cookie Attribute Injection via Capitalized kwargs

Summary

Tornado before 6.5.8 contains an incomplete fix for cookie attribute injection that allows attackers to inject arbitrary cookie attributes by passing capitalized or legacy keyword arguments to set_cookie. Attackers can embed semicolon-delimited data in capitalized parameters like Domain, Path, or SameSite to bypass validation and modify cookie security attributes.

Severity

6.3 (Medium)


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

5.4 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-21 19:14 UTC

CWE

CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6398 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: 6.5.5 , < 6.5.8 (semver) Unaffected: 6.5.8 (semver) cpe:2.3:a:tornadoweb:tornado::::::::

Date Public

2026-08-07 00:00

Credits

sec-reex arpitjain099

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.

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SUSE-SU-2026:24121-1

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

CVE-2026-91990 (GCVE-0-2026-91990)

CVE-2026-91991 (GCVE-0-2026-91991)

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Vulnerability timeline

Related by attack behaviour