PyPI/tornado CVE-2026-49855: high 7.5, EPSS 0.57%

tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)

Action: Upgrade tornado to 6.5.6 or later.

pip install tornado==6.5.6

Affected

Fixed versions

Sources

• osv: GHSA-mgf9-4vpg-hj56
• https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56
• https://github.com/tornadoweb/tornado

CVE-2026-49855 · published 2026-06-15T20:19:28Z · modified 2026-09-10T03:51:09.080081033Z · JSON