{"id":"UBUNTU-CVE-2020-1893","details":"Insufficient boundary checks when decoding JSON in TryParse reads out of bounds memory, potentially leading to DOS. This issue affects HHVM 4.45.0, 4.44.0, 4.43.0, 4.42.0, 4.41.0, 4.40.0, 4.39.0, versions between 4.33.0 and 4.38.0 (inclusive), versions between 4.9.0 and 4.32.0 (inclusive), and versions prior to 4.8.7.","modified":"2026-04-22T14:09:52.590174Z","published":"2020-03-03T15:15:00Z","upstream":["CVE-2020-1893"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-1893"},{"type":"REPORT","url":"https://github.com/facebook/hhvm/commit/bd586671a3c22eb2f07e55f11b3ce64e1f7961e7"},{"type":"REPORT","url":"https://hhvm.com/blog/2020/02/20/security-update.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-1893"}],"affected":[{"package":{"name":"hhvm","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/hhvm@3.11.1+dfsg-1ubuntu1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.11.0+dfsg-1","3.11.1+dfsg-1","3.11.1+dfsg-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.11.1+dfsg-1ubuntu1","binary_name":"hhvm"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-1893.json"}},{"package":{"name":"hhvm","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/hhvm@3.21.0+dfsg-2ubuntu2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.21.0+dfsg-2","3.21.0+dfsg-2build1","3.21.0+dfsg-2build2","3.21.0+dfsg-2build3","3.21.0+dfsg-2ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"3.21.0+dfsg-2ubuntu2","binary_name":"hhvm"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-1893.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}