{"id":"CVE-2018-18020","aliases":["DEBIAN-CVE-2018-18020","DLA-3548-1","EUVD-2018-9759","GHSA-r676-q927-78rr","UBUNTU-CVE-2018-18020","USN-5026-1","USN-5026-2"],"status":"published","title":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild...","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","severity":{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01209,"percentile":0.68652,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674"],"published":"2018-10-06T00:00:00Z","modified":"2026-10-23T18:03:55Z","fixes":[{"ecosystem":"Debian:12","package":"qpdf","fixed_in":["9.0.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"qpdf","fixed_in":["9.0.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"qpdf","fixed_in":["9.0.0-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"qpdf","fixed_in":["8.0.2-3~16.04.1+esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"qpdf","fixed_in":["8.0.2-3ubuntu0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"qpdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"qpdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"qpdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.0-1"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"qpdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4.0-2+deb10u1"}]}],"versions":["8.4.0-2"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"qpdf","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"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"qpdf","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"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"qpdf","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"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"qpdf","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"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"qpdf","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"],"bundled":2}],"products":[{"vendor":"qpdf_project","product":"qpdf"}],"references":[{"url":"https://github.com/qpdf/qpdf/issues/243","tags":["x_transferred","Exploit","Issue Tracking","Third Party Advisory","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2023/08/msg00037.html","tags":["mailing-list","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-18020"},{"url":"https://github.com/advisories/GHSA-r676-q927-78rr"},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-18020","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2018-18020","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5026-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-5026-2","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-18020","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-36978","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2018-18020","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","status":"published","published":"2018-10-06T00:00:00Z","modified":"2024-08-05T11:01:14.763Z","updated_at":"2026-11-02T14:35:11.426178Z"}],"euvd":[{"id":"EUVD-2018-9759","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","status":"published","published":"2018-10-06T00:00:00Z","modified":"2024-08-05T11:01:14Z","updated_at":"2026-11-03T02:39:37.172177Z"}],"ghsa":[{"id":"GHSA-r676-q927-78rr","title":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild...","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","status":"published","published":"2022-05-13T01:19:31Z","modified":"2023-08-30T03:30:12Z","cvss":[{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:54:46.481792Z"}],"nvd":[{"id":"CVE-2018-18020","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","status":"published","published":"2018-10-06T14:29:00.66Z","modified":"2026-06-17T01:46:41.58Z","cvss":[{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:04:42.52179Z"}],"osv":[{"id":"CVE-2018-18020","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","status":"published","published":"2018-10-06T14:29:00.66Z","modified":"2026-10-20T10:47:35.836187315Z","cvss":[{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:44:08.834469Z"},{"id":"DEBIAN-CVE-2018-18020","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","status":"published","published":"2018-10-06T14:29:00.66Z","modified":"2026-10-23T18:03:55.726711965Z","cvss":[{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:45:30.57382Z"},{"id":"UBUNTU-CVE-2018-18020","description":"In QPDF 8.2.1, in libqpdf/QPDFWriter.cc, QPDFWriter::unparseObject and QPDFWriter::unparseChild have recursive calls for a long time, which allows remote attackers to cause a denial of service via a crafted PDF file.","status":"published","published":"2018-10-06T14:29:00Z","modified":"2026-04-22T11:49:20.048583Z","cvss":[{"version":"3.0","score":3.3,"vector":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:54:17.496046Z"},{"id":"DLA-3548-1","title":"qpdf - security update","status":"published","published":"2023-08-29T00:00:00Z","modified":"2026-03-09T01:17:57.671806Z","updated_at":"2026-11-02T15:46:11.734021Z"},{"id":"USN-5026-1","title":"qpdf vulnerabilities","description":"It was discovered that QPDF incorrectly handled certain malformed PDF\nfiles. A remote attacker could use this issue to cause QPDF to consume\nresources, resulting in a denial of service. This issue only affected\nUbuntu 18.04 LTS. (CVE-2018-18020)\n\nIt was discovered that QPDF incorrectly handled certain malformed PDF\nfiles. A remote attacker could use this issue to cause QPDF to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2021-36978)\n","status":"published","published":"2021-07-29T16:28:39Z","modified":"2026-04-22T10:16:09.686601Z","updated_at":"2026-11-02T16:58:15.683829Z"},{"id":"USN-5026-2","title":"qpdf vulnerabilities","description":"USN-5026-1 fixed several vulnerabilities in QPDF. This update provides\nthe corresponding update for Ubuntu 16.04 ESM.\nOriginal advisory details:\n\n It was discovered that QPDF incorrectly handled certain malformed PDF\n files. A remote attacker could use this issue to cause QPDF to consume\n resources, resulting in a denial of service. (CVE-2018-18020)\n\n It was discovered that QPDF incorrectly handled certain malformed PDF\n files. A remote attacker could use this issue to cause QPDF to crash,\n resulting in a denial of service, or possibly execute arbitrary code.\n (CVE-2021-36978)\n","status":"published","published":"2021-08-02T14:15:25Z","modified":"2026-06-25T13:30:42.08817032Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}