Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response. Attackers can send a gzip-encoded decompression bomb that accumulates in memory without size limits, causing the application process to be killed by out-of-memory conditions.

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 Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:82040 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2026:82041 advisory.

    Python is an interpreted, interactive, object-oriented programming language, which includes modules,     classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to     many system calls and libraries, as well as to various windowing systems.

    Security Fix(es):

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

The remote Oracle Linux 10 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-82041 advisory.

    [6.5.10-1.1]
    - Update to 6.5.10       Resolves: RHEL-274866

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

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

The remote MiracleLinux 9 host has a package installed that is affected by a vulnerability as referenced in the AXSA:2026-2053:04 advisory.

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

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

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

The Rocky Linux 9 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-2026_82040 advisory.

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

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

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

The Rocky Linux 10.2 host has packages installed that are affected by a vulnerability as referenced in the CIQ crlsa-2026_82041 advisory.

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

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

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

The remote RockyLinux 10 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:82041 advisory.

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

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

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

The remote AlmaLinux 10 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:82041 advisory.

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

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

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

The remote AlmaLinux 9 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2026:82040 advisory.

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

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

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

The remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:82040 advisory.

    * tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient (CVE-2026-103262)

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

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

The remote Oracle Linux 9 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2026-82040 advisory.

    [6.5.10-1.1]
    - Update to 6.5.10       Resolves: RHEL-274870

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

Note that Nessus has not tested for this issue 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 versions before 6.5.9 contain an unbounded memory accumulation vulnerability in     CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed     response. Attackers can send a gzip-encoded decompression bomb that accumulates in memory without size     limits, causing the application process to be killed by out-of-memory conditions. (CVE-2026-103262)

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
369184	RHEL 9 : python-tornado (RHSA-2026:82040)	Nessus	Red Hat Local Security Checks	Local	high
369183	RHEL 10 : python-tornado (RHSA-2026:82041)	Nessus	Red Hat Local Security Checks	Local	high
368015	Oracle Linux 10 : python-tornado (ELSA-2026-82041)	Nessus	Oracle Linux Local Security Checks	Local	high
366083	MiracleLinux 9 : python-tornado-6.5.10-1.el9_8.1 (AXSA:2026-2053:04)	Nessus	Miracle Linux Local Security Checks	Local	high
366073	Rocky Linux 9 [CIQ] Security Update: python-tornado-debugsource / python3-tornado / etc (crlsa-2026_82040)	Nessus	Rocky Linux Local Security Checks	Local	high
366042	Rocky Linux 10.2 [CIQ] Security Update: python-tornado-debugsource / python3-tornado / etc (crlsa-2026_82041)	Nessus	Rocky Linux Local Security Checks	Local	high
365633	RockyLinux 10 : python-tornado (RLSA-2026:82041)	Nessus	Rocky Linux Local Security Checks	Local	high
365616	AlmaLinux 10 : python-tornado (ALSA-2026:82041)	Nessus	Alma Linux Local Security Checks	Local	high
365615	AlmaLinux 9 : python-tornado (ALSA-2026:82040)	Nessus	Alma Linux Local Security Checks	Local	high
365537	RockyLinux 9 : python-tornado (RLSA-2026:82040)	Nessus	Rocky Linux Local Security Checks	Local	high
365488	Oracle Linux 9 : python-tornado (ELSA-2026-82040)	Nessus	Oracle Linux Local Security Checks	Local	high
359484	Linux Distros Unpatched Vulnerability : CVE-2026-103262	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-103262

high

Tenable Plugins

critical

high

high

high

high

high

high

high

high

high

high

high

high