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OpenAdvisories
Medium · 5.3 CVE-2026-49854 EUVD-2026-44504GHSA-cx3h-4qpv-8hc9PYSEC-2026-3388

Tornado: Out-of-bounds memory access in C extension

Published Jul 14, 2026 · Updated Jul 15, 2026 · Assigned by GitHub_M

Vendor: tornadoweb Product: tornado Package: airflow-3 Package: mitmproxy Package: python-tornado Package: python-tornado Package: python-tornado Package: tornado Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: PyPI Ecosystem: Ubuntu Ecosystem: Wolfi

Description

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, the optional native extension tornado.speedups implemented websocket_mask without validating that the mask argument is exactly four bytes, allowing the C function to read up to three bytes beyond the provided buffer when reached through Tornado XSRF token decoding with the native extension active. This issue is fixed in version 6.5.6.

Affected products

VendorProductAffectedFixed
tornadoweb tornado < 6.5.6 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 python-tornado No fix yet —
Debian 13 python-tornado No fix yet —
Debian 12 python-tornado No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 python-tornado No fix yet —
Ubuntu 26.04 LTS python-tornado No fix yet —
Ubuntu 24.04 LTS python-tornado No fix yet —
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro 22.04 LTS python-tornado No fix yet —
Ubuntu Pro 20.04 LTS python-tornado No fix yet —
Ubuntu Pro 18.04 LTS python-tornado No fix yet —
Ubuntu Pro 16.04 LTS python-tornado No fix yet —

SUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
SLES 15 SP7 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLES 15 SP6 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLES 15 SP6 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
SLES 15 SP5 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLES 15 SP5 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
SLES 15 SP4 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLES 15 SP4 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
SLES 3 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
Show 25 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 16.0 python-tornado6 6.5-160000.5.1 SUSE-SU-2026:22373-1
SLES for SAP 15 SP6 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLES for SAP 15 SP6 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
SLES for SAP 15 SP5 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLES for SAP 15 SP5 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
SLES for SAP 15 SP4 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLES for SAP 15 SP4 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
SLES 16.0 python-tornado6 6.5-160000.5.1 SUSE-SU-2026:22373-1
SLE Micro 6.2 python-tornado6 6.5-160000.5.1 SUSE-SU-2026:22286-1
SLE Micro 6.1 python-tornado6 6.4-slfo.1.1_5.1 SUSE-SU-2026:22445-1
SLE Micro 6.0 python-tornado6 6.4-6.1 SUSE-SU-2026:22430-1
SLE Micro 5.5 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLE Micro 5.4 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLE Micro 5.3 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLE HPC 15 SP5 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLE HPC 15 SP5 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
SLE HPC 15 SP4 python-tornado 4.5.3-150000.3.22.1 SUSE-SU-2026:2726-1
SLE HPC 15 SP4 python-tornado6 6.3.2-150400.9.18.1 SUSE-SU-2026:2725-1
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SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cffi 1.17.1-80002.3.6.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cryptography 3.3.2-80002.3.6.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cssselect 1.3.0-80002.3.6.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-editables 0.5-80002.3.3.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-exceptiongroup +1 1.2.2-80002.3.3.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-flit-core 3.12.0-80002.3.3.4 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-fancy-pypi-readme +1 25.1.0-80002.3.3.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-vcs +1 0.5.0-80002.3.3.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatchling 1.31.0-80002.3.3.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-idna 3.10-80002.3.6.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-iniconfig 2.1.0-80002.3.3.3 SUSE-SU-2026:4581-1
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SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-jinja2 3.1.6-80002.5.3.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-lxml 6.1.1-80002.3.9.5 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-packaging 24.2-80002.3.3.3 SUSE-SU-2026:4581-1
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SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1 0.6.3-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1-modules 0.4.2-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyopenssl 23.2.0-80002.3.9.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyparsing 3.0.9-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-requests 2.34.2-80002.4.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-tornado 6.3.2-80002.4.12.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-urllib3 2.0.7-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-websocket-client 1.9.0-80002.3.6.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update scap-security-guide 0.1.80-80002.3.12.4 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update spacecmd 5.2.10-80002.3.15.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update uyuni-tools 5.2.17-80002.3.15.3 SUSE-SU-2026:4581-1
SUSE RES-8:Update:Products:MultiLinuxManagerTools:Update venv-salt-minion 3006.0-80002.5.22.3 SUSE-SU-2026:4581-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update mgr-push 5.2.5-70002.3.12.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy +1 3.11.15-70002.4.15.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cffi 1.17.1-70002.3.6.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cryptography 3.3.2-70002.3.6.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cssselect 1.3.0-70002.3.6.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-editables 0.5-70002.3.3.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-exceptiongroup +1 1.2.2-70002.3.3.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-flit-core 3.12.0-70002.3.3.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-fancy-pypi-readme +1 25.1.0-70002.3.3.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-vcs +1 0.5.0-70002.3.3.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatchling 1.31.0-70002.3.3.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-idna 3.10-70002.3.6.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-iniconfig 2.1.0-70002.3.3.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-iniconfig-test 2.1.0-70002.3.3.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-jinja2 3.1.6-70002.5.3.2 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-lxml 6.1.1-70002.3.9.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-packaging 24.2-70002.3.3.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pip 25.0.1-70002.3.3.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1 0.6.3-70002.3.6.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1-modules 0.4.2-70002.3.6.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyopenssl 23.2.0-70002.3.9.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyparsing 3.0.9-70002.3.6.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-requests 2.34.2-70002.4.6.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-tornado 6.3.2-70002.4.12.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-urllib3 2.0.7-70002.3.6.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-websocket-client 1.9.0-70002.3.6.1 SUSE-SU-2026:4583-1
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SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update spacewalk-client-tools 5.2.7-70002.3.12.1 SUSE-SU-2026:4583-1
SUSE RES-7:Update:Products:MultiLinuxManagerTools:Update venv-salt-minion 3006.0-70002.5.22.1 SUSE-SU-2026:4583-1
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SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cryptography 3.3.2-100002.1.6.2 SUSE-SU-2026:4580-1
SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cssselect 1.3.0-100002.1.6.2 SUSE-SU-2026:4580-1
SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-editables 0.5-100002.1.6.2 SUSE-SU-2026:4580-1
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SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyopenssl 23.2.0-100002.1.9.1 SUSE-SU-2026:4580-1
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SUSE EL-10:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-requests 2.34.2-100002.1.9.1 SUSE-SU-2026:4580-1
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SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cryptography 3.3.2-90002.3.6.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-cssselect 1.3.0-90002.3.6.2 SUSE-SU-2026:4582-1
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SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-flit-core 3.12.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-fancy-pypi-readme +1 25.1.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatch-vcs +1 0.5.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-hatchling 1.31.0-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-idna 3.10-90002.3.6.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-iniconfig 2.1.0-90002.3.3.1 SUSE-SU-2026:4582-1
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SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-lxml 6.1.1-90002.3.9.2 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-packaging 24.2-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pip 25.0.1-90002.3.3.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1 0.6.3-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyasn1-modules 0.4.2-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyopenssl 23.2.0-90002.3.9.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-pyparsing 3.0.9-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-requests 2.34.2-90002.4.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-tornado 6.3.2-90002.4.12.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-urllib3 2.0.7-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update saltbundlepy-websocket-client 1.9.0-90002.3.6.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update scap-security-guide 0.1.80-90002.3.12.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update spacecmd 5.2.10-90002.3.15.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update uyuni-tools 5.2.17-90002.3.15.1 SUSE-SU-2026:4582-1
SUSE EL-9:Update:Products:MultiLinuxManagerTools:Update venv-salt-minion 3006.0-90002.5.22.1 SUSE-SU-2026:4582-1

openSUSE

Security tracker ↗
ReleasePackageFixed inAdvisory
openSUSE Tumbleweed python-tornado6 6.5.7-1.1 openSUSE-SU-2026:11027-1
openSUSE Leap 16.0 python-tornado6 6.5-160000.5.1 openSUSE-SU-2026:21067-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2023 python3-tornado +1 6.1.0-2.amzn2023.0.9 ALAS2023-2026-2016
Amazon Linux 2023 python3.13-tornado +1 6.4.2-1.amzn2023.0.4 ALAS2023-2026-2015
Amazon Linux 2 python-tornado +1 4.2.1-3.amzn2.0.6 ALAS2-2026-3847
Amazon Linux 2 python3-tornado +1 5.0.2-4.amzn2.0.9 ALAS2-2026-3846

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 python-tornado No fix yet —

Wolfi

ReleasePackageFixed inAdvisory
Wolfi rolling airflow-3 3.2.2-r4 —
Wolfi rolling mitmproxy 12.2.3-r1 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI tornado < 6.5.6 6.5.6 GHSA-cx3h-4qpv-8hc9

Advisories 19

References