Most recent entries from all

BREW-jupyterlab-CVE-2026-49854 — Tornado has out-of-bounds memory access via C extension

Affected: Homebrew: jupyterlab

### Summary

Tornado'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's XSRF token decoder when `xsrf_cookies=True` and the native extension is active.

### Mitigations

This 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).

Withdrawn: CLEANSTART-2026-EG99213 — Security fixes in tensorflow-gpu-jupyter 2.21.0-r7

Withdrawn by the publisher.

Affected: CleanStart: tensorflow-gpu-jupyter

Package tensorflow-gpu-jupyter version 2.21.0-r7 fixes 2 vulnerabilities: CVE-2026-49854, ghsa-cx3h-4qpv-8hc9

EUVD-2026-337917

fkie_cve-2026-49854

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.

GHSA-cx3h-4qpv-8hc9 — Tornado has out-of-bounds memory access via C extension

Affected: PyPI: tornado

### Summary

The behavior is reachable from Tornado's XSRF token decoder when `xsrf_cookies=True` and the native extension is active.

### Mitigations

OESA-2026-2727 — python-tornado security update

Affected: openEuler:24.03-LTS-SP1: python-tornado

Tornado is an open source version of the scalable, non-blocking web server and tools. Security Fix(es):

When 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)

SummaryTornado'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'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 expe…

openSUSE-SU-2026:11027-1 — python311-tornado6-6.5.7-1.1 on GA media

python311-tornado6-6.5.7-1.1 on GA media

PYSEC-2026-3388 — Tornado has out-of-bounds memory access via C extension

Affected: PyPI: tornado

### Summary

The behavior is reachable from Tornado's XSRF token decoder when `xsrf_cookies=True` and the native extension is active.

### Mitigations

SUSE-SU-2026:22286-1 — Security update for python-tornado6

Security update for python-tornado6

UBUNTU-CVE-2026-49854

Affected: Ubuntu:Pro:16.04:LTS: python-tornado, Ubuntu:Pro:18.04:LTS: python-tornado, Ubuntu:Pro:20.04:LTS: python-tornado, Ubuntu:Pro:22.04:LTS: python-tornado, Ubuntu:24.04:LTS: python-tornado, Ubuntu:26.04:LTS: python-tornado