It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1502 advisory.

    Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to     6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default     100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-     service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is     fixed in 6.5.5. (CVE-2026-31958)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update of the python3 package has been released.

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:13670 advisory.

    * tornado-python: Tornado: Denial of Service via large multipart bodies (CVE-2026-31958)

    * tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments     (CVE-2026-35536)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote MiracleLinux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2026-556:01 advisory.

    * tornado-python: Tornado: Denial of Service via large multipart bodies (CVE-2026-31958)
      * tornado: Tornado: Cookie attribute injection due to improper handling of cookie arguments     (CVE-2026-35536)

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1528 advisory.

    Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, the     supplied reason phrase is used unescaped in HTTP headers (where it could be used for header injection) or     in HTML in the default error page (where it could be used for XSS) and can be exploited by passing     untrusted or malicious data into the reason argument. Used by both RequestHandler.set_status and     tornado.web.HTTPError, the argument is designed to allow applications to pass custom reason phrases (the     Not Found in HTTP/1.1 404 Not Found) to the HTTP status line (mainly for non-standard status codes).
    This issue is fixed in version 6.5.3. (CVE-2025-67724)

    Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, a     single maliciously crafted HTTP request can block the server's event loop for an extended period, caused     by the HTTPHeaders.add method. The function accumulates values using string concatenation when the same     header name is repeated, causing a Denial of Service (DoS).  Due to Python string immutability, each     concatenation copies the entire string, resulting in O(n2) time complexity. The severity can vary from     high if max_header_size has been increased from its default, to low if it has its default value of 64KB.
    This issue is fixed in version 6.5.3. (CVE-2025-67725)

    Tornado is a Python web framework and asynchronous networking library. Versions 6.5.2 and below use an     inefficient algorithm when parsing parameters for HTTP header values, potentially causing a DoS. The
    _parseparam function in httputil.py is used to parse specific HTTP header values, such as those in     multipart/form-data and repeatedly calls string.count() within a nested loop while processing quoted     semicolons. If an attacker sends a request with a large number of maliciously crafted parameters in a     Content-Disposition header, the server's CPU usage increases quadratically (O(n2)) during parsing. Due to     Tornado's single event loop architecture, a single malicious request can cause the entire server to become     unresponsive for an extended period. This issue is fixed in version 6.5.3. (CVE-2025-67726)

    Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to     6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default     100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-     service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is     fixed in 6.5.5. (CVE-2026-31958)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
304575	Amazon Linux 2023 : python3-tornado (ALAS2023-2026-1502)	Nessus	Amazon Linux Local Security Checks	2026/4/1	2026/4/1	high
310200	Photon OS 4.0: Python3 PHSA-2026-4.0-1003	Nessus	PhotonOS Local Security Checks	2026/4/25	2026/4/29	high
310247	Photon OS 5.0: Python3 PHSA-2026-5.0-0830	Nessus	PhotonOS Local Security Checks	2026/4/25	2026/4/30	high
312323	RockyLinux 9 : python-tornado (RLSA-2026:13670)	Nessus	Rocky Linux Local Security Checks	2026/5/6	2026/5/6	high
312848	MiracleLinux 9 : python-tornado-6.5.5-1.el9_7.1 (AXSA:2026-556:01)	Nessus	Miracle Linux Local Security Checks	2026/5/7	2026/5/7	high
304609	Amazon Linux 2023 : python3.13-tornado (ALAS2023-2026-1528)	Nessus	Amazon Linux Local Security Checks	2026/4/1	2026/4/1	high

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