{"id":"UBUNTU-CVE-2026-59941","details":"Dompdf is an HTML to PDF converter for PHP. Versions 3.15 and prior accept a BMP image and generates a PDF-compatible PNG based only on its declared header dimensions and never bounds width × height before the image is converted through GD. A 58-byte BMP whose header declares e.g. 6000×6000 is accepted and later drives imagecreatetruecolor($width, $height) (and PHP's native BMP decoder) to allocate the full pixel canvas. A payload can fit in a single HTTP request: the BMP can be inlined as a data:image/bmp;base64,… URI inside attacker-controlled HTML, so no upload, no remote fetch, and no chroot-reachable file is required. I measured a 169-byte request driving a dompdf render to ~412 MB peak RSS and ~4.8 s of CPU/wall time, versus ~34 MB for an identically-sized benign request — roughly a 12× memory amplification per request, repeatable and unauthenticated. This issue has been fixed in version 3.16.","modified":"2026-08-06T03:13:28.537852020Z","published":"2026-07-28T21:17:00Z","upstream":["CVE-2026-59941"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-59941"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-59941"},{"type":"REPORT","url":"https://github.com/dompdf/dompdf/security/advisories/GHSA-8hg6-c449-896m"},{"type":"REPORT","url":"https://github.com/dompdf/dompdf/commit/7c65e7bbeccf146b2409740405af73949ad129d0"},{"type":"REPORT","url":"https://github.com/dompdf/dompdf/releases/tag/v3.1.6"}],"affected":[{"package":{"name":"php-dompdf","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/php-dompdf?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.1+dfsg-2","0.6.1+dfsg-2build1","0.6.1+dfsg-2ubuntu1","0.6.1+dfsg-2ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-dompdf","binary_version":"0.6.1+dfsg-2ubuntu1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59941.json"}},{"package":{"name":"php-dompdf","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/php-dompdf?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2+dfsg-3","0.6.2+dfsg-3ubuntu0.18.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-dompdf","binary_version":"0.6.2+dfsg-3ubuntu0.18.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59941.json"}},{"package":{"name":"php-dompdf","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/php-dompdf?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2+dfsg-3","0.6.2+dfsg-3ubuntu0.20.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-dompdf","binary_version":"0.6.2+dfsg-3ubuntu0.20.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59941.json"}},{"package":{"name":"php-dompdf","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/php-dompdf?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.2+dfsg-3.1","0.6.2+dfsg-3.1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-dompdf","binary_version":"0.6.2+dfsg-3.1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59941.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"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"}]}