{"id":"CVE-2021-21426","aliases":["GHSA-m496-x567-f98c"],"url":"https://o3.security/vulnerability/CVE-2021-21426","summary":"Fixes a bug in Zend Framework's Stream HTTP Wrapper","details":"Magento-lts is a long-term support alternative to Magento Community Edition (CE). In magento-lts versions 19.4.12 and prior and 20.0.8 and prior, there is a vulnerability caused by the unsecured deserialization of an object. A patch in versions 19.4.13 and 20.0.9 was back ported from Zend Framework 3. The vulnerability was assigned CVE-2021-3007 in Zend Framework.","published":"2021-04-21T21:15:07.960Z","modified":"2026-08-07T11:31:29.855810356Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Packagist","name":"openmage/magento-lts","fixedVersion":"19.4.13"},{"ecosystem":"Packagist","name":"openmage/magento-lts","fixedVersion":"20.0.9"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/OpenMage/magento-lts/security/advisories/GHSA-m496-x567-f98c"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:29.855810356Z"}}