CVE-2026-103262

HIGH 7.5

Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-409
Vendor	tornadoweb
Product	tornado
Published	Oct 1, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

tornadoweb / tornado

0 < 6.5.9

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vp github.com: https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9 vulncheck.com: https://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-curlasynchttpclient

Credits

🔍 iaohkut-from-NightWolf-Team 🔍 aoto-tech