Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient
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.
CVE-2026-103262
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-103262
tornado
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "tornadoweb",
"product": "tornado",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "6.5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.5.9",
"versionType": "semver"
}
],
"packageURL": "pkg:pypi/tornado",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-103262
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #8963 · Revision 1
- Added to Heist Feed
- Publisher date