Vulnerability in tornadoweb tornado

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund21 Oct 2026WID-SEC-2026-4111

  Red Hat Ansible Automation Platform: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-11332CVE-2026-102938CVE-2026-103262+21 more CVEs
• BSI CERT-Bund12 Oct 2026WID-SEC-2026-3883

  Red Hat Enterprise Linux (goose, environment-modules, tornado): Multiple vulnerabilities Translated from German

  Risk highCVE-2026-93599CVE-2026-63128CVE-2026-103262+3 more CVEs

[ References ]References

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