CVE-2026-103262: Improper Handling of Highly Compressed Data (Data Amplification) in tornadoweb tornado
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.
AI Analysis
Technical Summary
CVE-2026-103262 describes an unbounded memory accumulation vulnerability in the CurlAsyncHTTPClient component of Tornado versions prior to 6.5.9. Remote attackers can exploit this by sending a specially crafted gzip-encoded decompression bomb as a response, which causes the application to consume excessive memory without limits, resulting in denial of service due to out-of-memory conditions.
Potential Impact
Successful exploitation allows remote attackers to cause denial of service by triggering out-of-memory conditions in the Tornado application process. This disrupts service availability but does not indicate privilege escalation or data compromise.
Mitigation Recommendations
A fix is available in Tornado version 6.5.9. Users should upgrade to version 6.5.9 or later to remediate this vulnerability.
CVE-2026-103262: Improper Handling of Highly Compressed Data (Data Amplification) in tornadoweb tornado
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.
CVSS v4.0
Score 8.7high
Affected software
tornadoweb
tornado
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103262 describes an unbounded memory accumulation vulnerability in the CurlAsyncHTTPClient component of Tornado versions prior to 6.5.9. Remote attackers can exploit this by sending a specially crafted gzip-encoded decompression bomb as a response, which causes the application to consume excessive memory without limits, resulting in denial of service due to out-of-memory conditions.
Potential Impact
Successful exploitation allows remote attackers to cause denial of service by triggering out-of-memory conditions in the Tornado application process. This disrupts service availability but does not indicate privilege escalation or data compromise.
Mitigation Recommendations
A fix is available in Tornado version 6.5.9. Users should upgrade to version 6.5.9 or later to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-30T10:55:39.869Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7494a43b0b3b89bd1cf6
Added to database: 10/01/2026, 14:56:20 UTC
Last enriched: 10/01/2026, 15:22:45 UTC
Last updated: 10/01/2026, 19:41:32 UTC
Views: 3
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