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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-49854)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 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 across cross-origin redirects in SimpleAsyncHTTPClient     (bsc#1268395).
    - CVE-2026-49854: out-of-bounds memory access via C extension (bsc#1268396).
    - CVE-2026-49855: AsyncHTTPClient accumulates decompressed chunks without size limit (bsc#1268397).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 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 across cross-origin redirects in SimpleAsyncHTTPClient     (bsc#1268395).
    - CVE-2026-49854: out-of-bounds memory access via C extension (bsc#1268396).
    - CVE-2026-49855: AsyncHTTPClient accumulates decompressed chunks without size limit (bsc#1268397).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22373-1 advisory.

    This update for python-tornado6 fixes the following issues

    - CVE-2026-49853: authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient     (bsc#1268395).
    - CVE-2026-49854: out-of-bounds memory access via C extension (bsc#1268396).
    - CVE-2026-49855: AsyncHTTPClient accumulates decompressed chunks without size limit (bsc#1268397).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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 SimpleAsyncHTTPClient     (bsc#1268395).
    - CVE-2026-49854: out-of-bounds memory access via C extension (bsc#1268396).
    - CVE-2026-49855: AsyncHTTPClient accumulates decompressed chunks without size limit (bsc#1268397).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-49854)

ID	Name	Product	Family	Severity
327111	Linux Distros Unpatched Vulnerability : CVE-2026-49854	Nessus	Misc.	medium
325033	SUSE SLED15 / SLES15 Security Update : python-tornado6 (SUSE-SU-2026:2725-1)	Nessus	SuSE Local Security Checks	high
325027	SUSE SLED15 / SLES15 Security Update : python-tornado (SUSE-SU-2026:2726-1)	Nessus	SuSE Local Security Checks	high
324858	SUSE SLES16 Security Update : python-tornado6 (SUSE-SU-2026:22373-1)	Nessus	SuSE Local Security Checks	high
324049	openSUSE 16 Security Update : python-tornado6 (openSUSE-SU-2026:21067-1)	Nessus	SuSE Local Security Checks	high
443118	SCA: security update for tornado (GHSA-cx3h-4qpv-8hc9)	Tenable Cloud Security	SCA Checks	medium
443118	SCA: security update for tornado (GHSA-cx3h-4qpv-8hc9)	Tenable Self-Hosted Container Security	SCA Checks	medium

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