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PYSEC-2026-1974 Tornado vulnerable to excessive logging caused by malformed multipart form data

🗓️ 07 Jul 2026 16:02:52Reported by GoogleType 
osv
 osv🔗 osv.dev👁 5 Views

Tornado before 6.5 allows log floods from malformed multipart data, causing denial of service; upgrade to 6.5.

Related
Refs
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IBM Security Bulletins		Security Bulletin: Tornado multipart/form-data Parser Vulnerability Enables Log-Based DoS Attack (Pre-6.5.0), which affects IBM watsonx.data
1 Sep 202514:49
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IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities affecting IBM Watson Studio in Cloud Pak for Data Are Addressed
28 Aug 202509:51
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IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - Monitor Component is vulnerable to tornado-6.4.2-cp38-abi3-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_17_x86_64.manylinux2014_x86_64.whl CVE-2025-47287
1 Sep 202513:06
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Tenable Nessus		Amazon Linux 2023 : python3-tornado (ALAS2023-2025-1002)
12 Jun 202500:00
–nessus
Tenable Nessus		Amazon Linux 2 : python-tornado (ALAS-2025-2888)
12 Jun 202500:00
–nessus
Tenable Nessus		Amazon Linux 2 : python3-tornado (ALAS-2025-2889)
12 Jun 202500:00
–nessus
Tenable Nessus		AlmaLinux 9 : python-tornado (ALSA-2025:8136)
27 May 202500:00
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Tenable Nessus		Debian dla-4188 : python-tornado-doc - security update
29 May 202500:00
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Tenable Nessus		Debian dsa-5938 : python-tornado-doc - security update
6 Jun 202500:00
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Tenable Nessus		MiracleLinux 9 : python-tornado-6.4.2-2.el9_6.2 (AXSA:2025-10491:02)
13 Jan 202600:00
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07 Jul 2026 17:48Current
7.1High risk
Vulners AI Score7.1
CVSS 3.17.5
EPSS0.00672
tornado vulnerabilitylog floodmalformed multipart datadenial of serviceupgrade guidanceproxy mitigation
5