Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with these characters to bypass proxy validation and smuggle requests when deployed behind certain proxies.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8952-1 advisory.

    It was discovered that Tornado did not properly handle certain HTTP requests and network inputs. An     attacker could possibly use these issues to cause a denial of service, expose sensitive information, or     bypass access controls.

    (CVE-2023-54397, CVE-2024-14029, CVE-2026-91990, CVE-2026-91992, CVE-2026-103262, CVE-2026-103263)

Tenable has extracted the preceding description block directly from the Ubuntu 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-2026:4404-1 advisory.

    - CVE-2023-54397: Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper     parsing of       Content-Length headers accepting non-standard characters. At (bsc#1280689).
    - CVE-2024-58384: CRLF injection in CurlAsyncHTTPClient headers (bsc#1281059).
    - CVE-2026-91990: splitting of multipart data before validation of the `max_parts` limit allows for     resource exhaustion       and a denial of service (bsc#1281439).
    - CVE-2026-91991: incomplete fix for cookie attribute injection allows for cookie validation bypass via     semicolon-       delimited data in capitalized parameters (bsc#1281440).

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-2026:4403-1 advisory.

    - CVE-2023-54397: Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper     parsing of       Content-Length headers accepting non-standard characters. At (bsc#1280689).
    - CVE-2024-58384: CRLF injection in CurlAsyncHTTPClient headers (bsc#1281059).
    - CVE-2026-91990: splitting of multipart data before validation of the `max_parts` limit allows for     resource exhaustion       and a denial of service (bsc#1281439).
    - CVE-2026-91991: incomplete fix for cookie attribute injection allows for cookie validation bypass via     semicolon-       delimited data in capitalized parameters (bsc#1281440).

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

  - Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-     Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with these     characters to bypass proxy validation and smuggle requests when deployed behind certain proxies.
    (CVE-2023-54397)

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

ID	Name	Product	Family	Type	Severity
371124	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS / 26.10 : Tornado vulnerabilities (USN-8952-1)	Nessus	Ubuntu Local Security Checks	Local	critical
362577	SUSE SLED15 / SLES15 Security Update : python-tornado (SUSE-SU-2026:4404-1)	Nessus	SuSE Local Security Checks	Local	critical
362544	SUSE SLED15 / SLES15 Security Update : python-tornado6 (SUSE-SU-2026:4403-1)	Nessus	SuSE Local Security Checks	Local	critical
346310	Linux Distros Unpatched Vulnerability : CVE-2023-54397	Nessus	Misc.	Local	critical

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