{"action":"Upgrade tornado to 6.5.6 or later.","affected":[{"fixed":"6.5.6","introduced":"0"}],"component":"tornado","cve_ids":["CVE-2026-49855"],"ecosystem":"PyPI","epss":0.00572,"exploited":false,"fixed_versions":["6.5.6"],"ghsa_id":"GHSA-mgf9-4vpg-hj56","id":"tcs_01M5KH526N3VMEQV1FH8P1V0KQ","modified_at":"2026-07-13T16:33:26.893507727Z","published_at":"2026-07-13T15:46:17.106405Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3389","https://github.com/tornadoweb/tornado/security/advisories/GHSA-mgf9-4vpg-hj56","https://github.com/tornadoweb/tornado","https://pypi.org/project/tornado","https://github.com/advisories/GHSA-mgf9-4vpg-hj56","https://nvd.nist.gov/vuln/detail/CVE-2026-49855"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-3389","url":"https://osv.dev/vulnerability/PYSEC-2026-3389"}],"summary":"tornado AsyncHTTPClient accumulates decompressed chunks without size limit (gzip bomb)"}