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.
History

Tue, 06 Oct 2026 01:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 02 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Thu, 01 Oct 2026 11:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient
First Time appeared Tornadoweb
Tornadoweb tornado
Weaknesses CWE-409
CPEs cpe:2.3:a:tornadoweb:tornado:*:*:*:*:*:*:*:*
Vendors & Products Tornadoweb
Tornadoweb tornado
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-01T10:42:04.913Z

Updated: 2026-10-06T00:08:58.078Z

Reserved: 2026-09-30T10:55:39.869Z

Link: CVE-2026-103262

cve-icon Vulnrichment

Updated: 2026-10-06T00:08:51.285Z

cve-icon NVD

Status : Deferred

Published: 2026-10-01T11:17:21.050

Modified: 2026-10-06T01:16:32.767

Link: CVE-2026-103262

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-01T10:42:04Z

Links: CVE-2026-103262 - Bugzilla