CVE-2026-103262
Published:October 01, 2026
Updated:October 13, 2026
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.
Affected Packages
tornado (CONDA):
Affected version(s) >=6.0.1 <6.5.9Fix Suggestion:
Update to version 6.5.9https://github.com/tornadoweb/tornado.git (GITHUB):
Affected version(s) >=v6.0.0 <v6.5.9Fix Suggestion:
Update to version v6.5.9tornado (PYTHON):
Affected version(s) >=6.0 <6.5.9Fix Suggestion:
Update to version 6.5.9Related Resources (11)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.53