---
title: "CVE-2026-103262: Tornado - Denial of Service"
description: "Tornado < 6.5.9 contains a denial of service vulnerability caused by unbounded memory accumulation in CurlAsyncHTTPClient when processing compressed responses, letting remote attackers cause application crash via decompression bomb, exploit requires sending crafted compressed response."
url: https://panop.io/threat-heartbeat/CVE-2026-103262/
---

# CVE-2026-103262 Tornado - Denial of Service

Tornado < 6.5.9 contains a denial of service vulnerability caused by unbounded memory accumulation in CurlAsyncHTTPClient when processing compressed responses, letting remote attackers cause application crash via decompression bomb, exploit requires sending crafted compressed response.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.53% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103262)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

1 October 2026

Updated

15 October 2026

Weakness

[CWE-409](https://cwe.mitre.org/data/definitions/409.html)

## Vendor fix

Upgrade to version 6.5.9 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103262](https://nvd.nist.gov/vuln/detail/CVE-2026-103262)
- [https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9](https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9)
- [https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vp](https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vp)
- [https://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-curlasynchttpclient](https://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-curlasynchttpclient)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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