CVE-2026-49853

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 Authorization, authusername, authpassword, and authmode in place when a redirect changed scheme, host, or port...

CVE-2026-49853 Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

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 Authorization, authusername, authpassword, and authmode in place when a redirect changed scheme, host, or port...

CVE-2026-49853 Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

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 Authorization, authusername, authpassword, and authmode in place when a redirect changed scheme, host, or port...

CVE-2026-49853

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 Authorization, authusername, authpassword, and authmode in place when a redirect changed scheme, host, or port...

SUSE-SU-2026:22708-1 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...

PYSEC-2026-3387 Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

Summary When SimpleAsyncHTTPClient follows a 3xx redirect, it shallow-copies the original HTTPRequest, rewrites the URL, decrements maxredirects, and removes only the Host header. It does not clear Authorization, authusername, authpassword, or authmode when the redirect target changes origin. As ...

PYSEC-2026-3389 tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)

Tornado's gzip decompression routines work in limited-size chunks, but have no overall limit for the total size of decompressed chunks that they will accumulate There has always been a limit for the total compressed size. This allows a malicious server to consume effectively unlimited amounts of...

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

Summary Tornado's optional native extension tornado.speedups implements websocketmask 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...

[SECURITY] Fedora 44 Update: python-tornado-6.5.7-1.fc44

Tornado is an open source version of the scalable, non-blocking web server and tools. The framework is distinct from most mainstream web server frameworks and certainly most Python frameworks because it is non-blocking and reasonably fast. Because it is non-blocking and uses epoll, it can handle...

[SECURITY] Fedora 43 Update: python-tornado-6.5.7-1.fc43

Tornado is an open source version of the scalable, non-blocking web server and tools. The framework is distinct from most mainstream web server frameworks and certainly most Python frameworks because it is non-blocking and reasonably fast. Because it is non-blocking and uses epoll, it can handle...

OPENSUSE-SU-2026:11239-1 python313-tornado6-6.5.7-2.1 on GA media

These are all security issues fixed in the python313-tornado6-6.5.7-2.1 package on the GA media of openSUSE Tumbleweed...

Important Photon OS Security Update - PHSA-2026-4.0-1053

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

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

Summary When Tornado's multipart/form-data parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the...

PYSEC-2026-1975 Tornado has an HTTP cookie parsing DoS vulnerability

The algorithm used for parsing HTTP cookies in Tornado versions prior to 6.4.2 sometimes has quadratic complexity, leading to excessive CPU consumption when parsing maliciously-crafted cookie headers. This parsing occurs in the event loop thread and may block the processing of other requests. See...

SUSE SLED15 / SLES15 Security Update : python-tornado (SUSE-SU-2026:2726-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2726-1 advisory. This update for python-tornado fixes the following issues - CVE-2026-49853: authorization header forwarded...

SUSE SLED15 / SLES15 Security Update : python-tornado6 (SUSE-SU-2026:2725-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2725-1 advisory. This update for python-tornado6 fixes the following issues - CVE-2026-49853: authorization header forwarded...

SUSE-SU-2026:2725-1 Security update for python-tornado6

This update for python-tornado6 fixes the following issues - CVE-2026-49853: authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient bsc1268395. - CVE-2026-49854: out-of-bounds memory access via C extension bsc1268396. - CVE-2026-49855: AsyncHTTPClient accumulates...

openSUSE 16 Security Update : python-tornado6 (openSUSE-SU-2026:21067-1)

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21067-1 advisory. This update for python-tornado6 fixes the following issues - CVE-2026-49853: authorization header forwarded across cross-origin redirects in...

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

This update for python-tornado6 fixes the following issues - CVE-2026-49853: authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient bsc1268395. - CVE-2026-49854: out-of-bounds memory access via C extension bsc1268396. - CVE-2026-49855: AsyncHTTPClient accumulates...

OPENSUSE-SU-2026:21067-1 Security update for python-tornado6

This update for python-tornado6 fixes the following issues - CVE-2026-49853: authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient bsc1268395. - CVE-2026-49854: out-of-bounds memory access via C extension bsc1268396. - CVE-2026-49855: AsyncHTTPClient accumulates...