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CVE-2026-103262— Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient

Quick assessment

Affected
tornadoweb tornado
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tornado 6.5.9 之前的版本在 CurlAsyncHTTPClient 中存在一个无界内存累积漏洞，允许远程攻击者通过发送压缩响应来触发拒绝服务（DoS）攻击。攻击者可发送一个经过 gzip 编码的“解压炸弹”，该数据在内存中无限制地累积，最终导致应用程序进程因内存耗尽（OOM）而被终止。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-103262

Vulnerability Information
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Vulnerability Title
Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tornadoweb tornado 0 ~ 6.5.9 -

II. Public POCs for CVE-2026-103262

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III. Intelligence Information for CVE-2026-103262

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Vendor Advisories for CVE-2026-103262 (2)

Same Patch Batch · tornadoweb · 2026-10-01 · 3 CVEs total

CVE-2026-103263 5.9 MEDIUM Tornado before 6.5.9 StaticFileHandler Path Traversal via Symlink
CVE-2026-103261 5.3 MEDIUM Tornado before 6.5.9 Denial of Service via Query String

IV. Related Vulnerabilities

Same product: tornado
Same vendor: tornadoweb
Same weakness: CWE-409

V. Comments for CVE-2026-103262

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