{"id":"UBUNTU-CVE-2021-36978","details":"QPDF 9.x through 9.1.1 and 10.x through 10.0.4 has a heap-based buffer overflow in Pl_ASCII85Decoder::write (called from Pl_AES_PDF::flush and Pl_AES_PDF::finish) when a certain downstream write fails.","modified":"2026-04-22T14:53:28.936874Z","published":"2021-07-20T07:15:00Z","related":["USN-5026-1","USN-5026-2"],"upstream":["CVE-2021-36978"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-36978"},{"type":"REPORT","url":"https://github.com/google/oss-fuzz-vulns/blob/main/vulns/qpdf/OSV-2020-2245.yaml"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5026-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5026-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-36978"}],"affected":[{"package":{"name":"qpdf","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/qpdf@8.0.2-3~16.04.1+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.2-3~16.04.1+esm1"}]}],"versions":["5.1.3-2","5.1.3-3","5.2.0-1","5.2.0-2","6.0.0-2","8.0.2-3~16.04.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libqpdf21","binary_version":"8.0.2-3~16.04.1+esm1"},{"binary_version":"8.0.2-3~16.04.1+esm1","binary_name":"qpdf"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36978.json"}},{"package":{"name":"qpdf","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/qpdf@8.0.2-3ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.2-3ubuntu0.1"}]}],"versions":["7.0.0-1","7.1.0-1","7.1.1-1","8.0.0-1","8.0.1-1","8.0.2-1","8.0.2-3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libqpdf21","binary_version":"8.0.2-3ubuntu0.1"},{"binary_name":"qpdf","binary_version":"8.0.2-3ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36978.json"}},{"package":{"name":"qpdf","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/qpdf@9.1.1-1ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.1.1-1ubuntu0.1"}]}],"versions":["8.4.2-1","9.0.2-1","9.1.0-1","9.1.1-1","9.1.1-1build1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libqpdf26","binary_version":"9.1.1-1ubuntu0.1"},{"binary_name":"qpdf","binary_version":"9.1.1-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-36978.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}