{"id":"CVE-2026-103262","title":"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","summary":"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 decom…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-409"],"vendor":"tornadoweb","product":"tornado","affected":["tornado < 6.5.9"],"patched":["tornado 6.5.9"],"published":"2026-10-01","updated":"2026-10-06","sourceUpdated":"2026-10-06T01:16:32.767","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103262","references":[{"url":"https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9","label":"disclosure@vulncheck.com"},{"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vp","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-curlasynchttpclient","label":"disclosure@vulncheck.com"},{"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vp","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/tornadoweb/tornado/pull/3719"},{"url":"https://github.com/tornadoweb/tornado/commit/15f056080d8e456f92cca8ad0c33e5a5480414ac"},{"url":"https://github.com/tornadoweb/tornado/commit/6564e0a0922c16f239d3a18adccd04736e380c89"},{"url":"https://github.com/tornadoweb/tornado/commit/aa2eb0d989716ac00fe8d7a9919b81c1eccd6ec4"},{"url":"https://github.com/tornadoweb/tornado"},{"url":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.9"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103262.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-103262"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2544534"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-103262"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103262"},{"url":"https://access.redhat.com/errata/RHSA-2026:82041"},{"url":"https://access.redhat.com/errata/RHSA-2026:82040"},{"url":"https://access.redhat.com/errata/RHSA-2026:84734"}],"tags":["nvd","cve.org","exploit-available","osv","pip","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-06T00:08:34.189311Z"},"epss":0.00628,"epssPercentile":0.49884,"aliases":["GHSA-chx6-46f5-w4vp"],"ecosystem":"pip","ingestedAt":"2026-10-01T11:42:53.805Z","slug":"CVE-2026-103262","body":"## Overview\n\nTornado 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-103262)\n\nAffected packages:\n\n- `tornado < 6.5.9`\n\nPatched in:\n\n- `tornado 6.5.9`\n\nSource: https://osv.dev/vulnerability/GHSA-chx6-46f5-w4vp\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Lightspeed Core, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4, … · no fix planned: OpenShift Lightspeed, Red Hat Enterprise Linux AI (RHEL AI) 3, Lightspeed Core, Red Hat Ansible Automation Platform 2, … · updated 2026-10-19 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103262.json)\n- **RHSA-2026:82041** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82041)\n- **RHSA-2026:82040** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82040)\n- **RHSA-2026:84734** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84734)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":216114,"id":"CVE-2026-103262","ts":1791247110985,"field":"exploit_available","old":"false","new":"true"}]}