CVE-2026-54134

OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, OctoPrint's custom Tornado upload handler and Flask with Werkzeug parse request parameters differently, allowing an attacker with FILEUPLOAD permission to inject reserved internal upload fields...

CVE-2026-54134

OctoPrint (web interface for 3D printers) versions prior to 1.11.8 and 2.0.0rc3 are vulnerable to file exfiltration via parser differentials between its custom Tornado upload handler and Flask/Werkzeug. An attacker with FILE_UPLOAD permission can inject reserved internal form fields through query...

CVE-2026-54134 OctoPrint: File exfiltration possible via query parameters on upload endpoints

OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, OctoPrint's custom Tornado upload handler and Flask with Werkzeug parse request parameters differently, allowing an attacker with FILEUPLOAD permission to inject reserved internal upload fields...

CVE-2026-67199

Perspective 5.0.0 contains a denial of service vulnerability that allows remote attackers to block the server event loop indefinitely by submitting a crafted expression containing unbounded for or while loop constructs in a TableMakeViewReq message. Attackers can embed an arbitrarily large...

CLSA-2026-1776386115 TuxCare security update for tornado (6 CVEs)

TuxCare rebuilt tornado to address 6 CVEs. Fixed in 6.1.0.post2+tuxcare...

CLSA-2026-1774830272 TuxCare security update for tornado (1 CVE)

TuxCare rebuilt tornado to address 1 CVE. Fixed in 5.1.1.post1+tuxcare...

CVE-2026-67199 Perspective 5.0.0 DoS via Loop Expression Evaluation

Perspective 5.0.0 contains a denial of service vulnerability that allows remote attackers to block the server event loop indefinitely by submitting a crafted expression containing unbounded for or while loop constructs in a TableMakeViewReq message. Attackers can embed an arbitrarily large...

Amazon Linux 2 : python-tornado, --advisory ALAS2-2026-3847 (ALAS-2026-3847)

The version of python-tornado installed on the remote host is prior to 4.2.1-3. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3847 advisory. Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient...

Amazon Linux 2 : python3-tornado, --advisory ALAS2-2026-3846 (ALAS-2026-3846)

The version of python3-tornado installed on the remote host is prior to 5.0.2-4. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3846 advisory. Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient...

Amazon Linux 2023 : python3.13-tornado (ALAS2023-2026-2015)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2015 advisory. 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...

Amazon Linux 2023 : python3-tornado (ALAS2023-2026-2016)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-2016 advisory. 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...

Important Photon OS Security Update - PHSA-2026-5.0-92-0939

Updates of 'python3-tornado' packages of Photon OS have been released...

Oracle Linux 7 : python-tornado (ELSA-2026-24342)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-24342 advisory. - Backport fix for CVE-2026-31958 Orabug: 39521310 Tenable has extracted the preceding description block directly from the Oracle Linux security...

SUSE-SU-2026:3160-1 Security update for python-tornado

This update for python-tornado fixes the following issues: - GHSA-pw6j-qg29-8w7f: CurlAsyncHTTPClient leaks per-request credentials on handle reuse bsc1269012...

SUSE-SU-2026:3155-1 Security update for python-tornado6

This update for python-tornado6 fixes the following issue - GHSA-pw6j-qg29-8w7f: CurlAsyncHTTPClient leaks per-request credentials on handle reuse bsc1269012...

GHSA-JHMP-MQWM-3GQ8 Tornado: Quadratic DoS via Crafted Multipart Parameters

Summary The parseparam function in Tornado's httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data. This function uses an inefficient algorithm that repeatedly calls string.count within a nested loop while processing quoted semicolons e.g., param=";". As a...

Tornado: Quadratic DoS via Crafted Multipart Parameters

Summary The parseparam function in Tornado's httputil.py is used to parse specific HTTP header values, such as those in multipart/form-data. This function uses an inefficient algorithm that repeatedly calls string.count within a nested loop while processing quoted semicolons e.g., param=";". As a...

EUVD-2025-203029

Tornado: Quadratic DoS via Crafted Multipart Parameters...

GHSA-C98P-7WGM-6P64 Tornado: Quadratic DoS via Repeated Header Coalescing

Summary The HTTPHeaders.add method in Tornado accumulates values using string concatenation when the same header name is repeated. Due to Python string immutability, each concatenation copies the entire string, resulting in On² time complexity. Given Tornado's single event loop architecture, a...

Tornado: Quadratic DoS via Repeated Header Coalescing

Summary The HTTPHeaders.add method in Tornado accumulates values using string concatenation when the same header name is repeated. Due to Python string immutability, each concatenation copies the entire string, resulting in On² time complexity. Given Tornado's single event loop architecture, a...