Vulnerability-Lookup

RHSA-2026:90283

Vulnerability from csaf_redhat - Published: 2026-10-26 15:51 - Updated: 2026-10-29 06:09

Summary

Red Hat Security Advisory: python-tornado security update

Severity

Important

Notes

Topic: An update for python-tornado is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. 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: 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: Tornado: Information disclosure via improper handling of credentials during HTTP redirects (CVE-2026-49853) * tornado: Tornado: Denial of Service via uncontrolled gzip decompression memory consumption (CVE-2026-49855) * tornado: Tornado: Denial of Service via memory amplification in multipart parsing (CVE-2026-91990) * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262) 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-2026-49853

A flaw was found in Tornado's SimpleAsyncHTTPClient. When following a redirect to a different origin, the client improperly retains and forwards sensitive authentication credentials, such as Authorization headers, to the new, potentially untrusted, destination. This vulnerability allows a remote attacker to gain unauthorized access to a user's credentials, leading to information disclosure.

7.7 (High)


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

CWE-201 - Insertion of Sensitive Information Into Sent Data

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-9.6.0.Z.EUS:python-tornado-0:6.4.2-2.el9_6.7.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python-tornado-debugsource-0:6.4.2-2.el9_6.7.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python-tornado-debugsource-0:6.4.2-2.el9_6.7.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python-tornado-debugsource-0:6.4.2-2.el9_6.7.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python-tornado-debugsource-0:6.4.2-2.el9_6.7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-0:6.4.2-2.el9_6.7.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-0:6.4.2-2.el9_6.7.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-0:6.4.2-2.el9_6.7.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-0:6.4.2-2.el9_6.7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-debuginfo-0:6.4.2-2.el9_6.7.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-debuginfo-0:6.4.2-2.el9_6.7.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-debuginfo-0:6.4.2-2.el9_6.7.s390x	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:python3-tornado-debuginfo-0:6.4.2-2.el9_6.7.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

CVE-2026-49855

A flaw was found in Tornado, a Python web framework and asynchronous networking library. Its gzip decompression routines process data in limited-size chunks but do not enforce an overall limit on the total accumulated decompressed data. This vulnerability allows a malicious server to consume effectively unlimited memory, leading to a denial of service, when accessed by a client using SimpleAsyncHTTPClient or an HTTPServer configured with decompress_request set to true.

7.5 (High)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 13 products, the same list as for CVE-2026-49853

Threats

Impact Important

CVE-2026-91990

A flaw was found in Tornado. This memory amplification vulnerability exists in the `parse_multipart_form_data` function, where multipart data is processed before validating the maximum number of parts. A remote attacker can exploit this by sending specially crafted multipart requests with numerous parts. This can lead to the creation of large temporary data structures, exhausting server memory and resulting in a Denial of Service (DoS) for the affected system.

7.5 (High)


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

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 13 products, the same list as for CVE-2026-49853

Threats

Impact Important

CVE-2026-103262

A flaw was found in Tornado. A remote malicious server can cause a Denial of Service (DoS) when an application using the CurlAsyncHTTPClient component fetches an untrusted web address. Because the client fails to enforce limits on incoming response sizes, the attacker can return a small, highly compressed payload (a decompression bomb) that expands to an enormous size. This unbounded memory consumption exhausts system resources and crashes the application.

7.5 (High)


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

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Affected products

Fixed 13 products, the same list as for CVE-2026-49853

Threats

Impact Important

References

34 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:90283	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2500672	external
https://bugzilla.redhat.com/show_bug.cgi?id=2500686	external
https://bugzilla.redhat.com/show_bug.cgi?id=2533953	external
https://bugzilla.redhat.com/show_bug.cgi?id=2544534	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-49853	self
https://bugzilla.redhat.com/show_bug.cgi?id=2500672	external
https://www.cve.org/CVERecord?id=CVE-2026-49853	external
https://nvd.nist.gov/vuln/detail/CVE-2026-49853	external
https://github.com/tornadoweb/tornado/commit/aba2…	external
https://github.com/tornadoweb/tornado/pull/3626	external
https://github.com/tornadoweb/tornado/releases/ta…	external
https://github.com/tornadoweb/tornado/security/ad…	external
https://access.redhat.com/security/cve/CVE-2026-49855	self
https://bugzilla.redhat.com/show_bug.cgi?id=2500686	external
https://www.cve.org/CVERecord?id=CVE-2026-49855	external
https://nvd.nist.gov/vuln/detail/CVE-2026-49855	external
https://github.com/tornadoweb/tornado/commit/ff80…	external
https://github.com/tornadoweb/tornado/security/ad…	external
https://access.redhat.com/security/cve/CVE-2026-91990	self
https://bugzilla.redhat.com/show_bug.cgi?id=2533953	external
https://www.cve.org/CVERecord?id=CVE-2026-91990	external
https://nvd.nist.gov/vuln/detail/CVE-2026-91990	external
https://github.com/tornadoweb/tornado/security/ad…	external
https://www.vulncheck.com/advisories/tornado-befo…	external
https://access.redhat.com/security/cve/CVE-2026-103262	self
https://bugzilla.redhat.com/show_bug.cgi?id=2544534	external
https://www.cve.org/CVERecord?id=CVE-2026-103262	external
https://nvd.nist.gov/vuln/detail/CVE-2026-103262	external
https://github.com/tornadoweb/tornado/commit/e412…	external
https://github.com/tornadoweb/tornado/security/ad…	external
https://www.vulncheck.com/advisories/tornado-befo…	external

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          "summary": "https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9",
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        },
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          "url": "https://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-curlasynchttpclient"
        }
      ],
      "release_date": "2026-10-01T10:42:04.913000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-26T15:51:58+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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            "AppStream-9.6.0.Z.EUS:python-tornado-debugsource-0:6.4.2-2.el9_6.7.aarch64",
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          },
          "url": "https://access.redhat.com/errata/RHSA-2026:90283"
        },
        {
          "category": "workaround",
          "details": "Restrict outbound HTTP client requests to trusted destinations and avoid using the CurlAsyncHTTPClient backend when fetching untrusted web content.\n\n1. Application configuration: Configure Tornado applications to utilize the default SimpleAsyncHTTPClient instead of CurlAsyncHTTPClient, provided specialized libcurl functionality (such as custom proxy configurations or specific TLS options) is not required. The default client enforces strict size boundaries on compressed and uncompressed response bodies.\n2. Network egress filtering: Implement firewall rules or egress network policies to restrict outbound HTTP/HTTPS connections exclusively to verified, trustworthy endpoints, preventing the client from contacting potentially malicious third-party servers.\n3. Operational controls: Ensure that user-supplied or untrusted URLs are validated, sanitized, or rejected before initiating outbound retrieval requests.\n\nCaveats: Switching the HTTP client backend from CurlAsyncHTTPClient to SimpleAsyncHTTPClient may disrupt services that depend on libcurl-specific features. Enforcing egress filtering may block connections to unlisted external services.",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient"
    }
  ]
}

CVE-2026-103262 (GCVE-0-2026-103262)

Vulnerability from cvelistv5 – Published: 2026-10-01 10:42 – Updated: 2026-10-06 00:08

Title

Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient

Summary

Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response. Attackers can send a gzip-encoded decompression bomb that accumulates in memory without size limits, causing the application process to be killed by out-of-memory conditions.

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 2026-10-06 00:08 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6980 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…	vendor-advisory
https://github.com/tornadoweb/tornado/commit/e412…	patch
https://www.vulncheck.com/advisories/tornado-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
tornadoweb	tornado	Affected: 0 , < 6.5.9 (semver) Unaffected: 6.5.9 (semver) cpe:2.3:a:tornadoweb:tornado::::::::

Date Public

2026-09-14 00:00

Credits

iaohkut-from-NightWolf-Team aoto-tech

Show details on NVD website

JSON

To clipboard

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CVE-2026-49853 (GCVE-0-2026-49853)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:41 – Updated: 2026-07-21 14:47

Title

Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

Summary

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.

Severity

7.7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-21 14:47 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7926 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/3626	x_refsource_MISC
https://github.com/tornadoweb/tornado/commit/aba2…	x_refsource_MISC
https://github.com/tornadoweb/tornado/releases/ta…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
tornadoweb	tornado	Affected: < 6.5.6

Show details on NVD website

JSON

To clipboard

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CVE-2026-49855 (GCVE-0-2026-49855)

Vulnerability from cvelistv5 – Published: 2026-07-14 20:45 – Updated: 2026-07-16 14:56

Title

tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)

Summary

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, Tornado gzip decompression routines processed limited-size chunks but did not enforce an overall limit on accumulated decompressed chunks, allowing a malicious server accessed by SimpleAsyncHTTPClient or an HTTPServer configured with decompress_request=True to consume effectively unlimited memory. This issue is fixed in version 6.5.6.

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 2026-07-16 14:55 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7926 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/tornadoweb/tornado/security/ad…	x_refsource_CONFIRM
https://github.com/tornadoweb/tornado/pull/3626	x_refsource_MISC
https://github.com/tornadoweb/tornado/commit/ff80…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
tornadoweb	tornado	Affected: < 6.5.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-49855",
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          "shortName": "CISA-ADP"
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            "attackComplexity": "LOW",
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        "advisory": "GHSA-mgf9-4vpg-hj56",
        "discovery": "UNKNOWN"
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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 6980 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

{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-91990",
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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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CVE-2026-49853 (GCVE-0-2026-49853)

CVE-2026-49855 (GCVE-0-2026-49855)

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

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Nomenclature

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Related by attack behaviour