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CVE-2026-103262

Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-103262

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-103262

Published

tornado

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "tornadoweb",
                    "product": "tornado",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "6.5.9"
                        },
                        {
                            "version": "6.5.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ],
                    "packageURL": "pkg:pypi/tornado"
                }

Original source record · Cite this exact observation · Complete original publisher JSON