CVE-2026-103262Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient
Updated under an hour ago ()
Does this affect you?
It affects tornadoweb tornado. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.53%, higher than 43% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-409
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.53% (percentile 43)
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
tornadoweb tornado tornadoweb:tornado (from the name) | before 6.5.9; 6.5.9 not affected | CNA record |
References
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vpvendor-advisory
- https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9patch
- https://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-curlasynchttpclientthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.