{"id":"CVE-2026-49286","aliases":["GHSA-2fmj-p74r-3wjm"],"url":"https://o3.security/vulnerability/CVE-2026-49286","summary":"PhpWeasyPrint vulnerable to PHAR deserialization via output filename (CVE-2023-28115 case-insensitive bypass)","details":"PhpWeasyPrint is a PHP library allowing PDF generation from a URL or an HTML page. Prior to version 2.6.0, `pontedilana/php-weasyprint` guarded the output filename against the `phar://` stream wrapper with a case-sensitive blacklist. PHP stream wrappers are case-insensitive, so `PHAR://`, `Phar://`, etc. bypass the check and reach `fileExists()` (`file_exists()`) in `prepareOutput()`. On PHP 7 (which the library still supports — PHP 7.4+), this triggers deserialization of a crafted PHAR archive's metadata, leading to remote code execution. This is the patch-bypass of CVE-2023-28115. The same issue and fix were handled upstream in KnpLabs/snappy (GHSA-92rv-4j2h-8mjj). PhpWeasyPrint version 2.6.0 contains a patch for the issue.","published":"2026-06-19T17:03:58.118Z","modified":"2026-08-12T03:51:33.569617422Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.0095,"percentile":0.5801,"asOf":"2026-08-11"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"pontedilana/php-weasyprint","fixedVersion":"2.6.0"}],"fix":{"url":"https://github.com/pontedilana/php-weasyprint/commit/d1aa487722b5a3cab9b222b85fdb5608a5a550c3","label":"pontedilana/php-weasyprint@d1aa487"},"references":[{"type":"WEB","url":"https://github.com/pontedilana/php-weasyprint/releases/tag/2.6.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49286.json"},{"type":"ADVISORY","url":"https://github.com/KnpLabs/snappy/security/advisories/GHSA-92rv-4j2h-8mjj"},{"type":"ADVISORY","url":"https://github.com/pontedilana/php-weasyprint/security/advisories/GHSA-2fmj-p74r-3wjm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49286"},{"type":"FIX","url":"https://github.com/pontedilana/php-weasyprint/commit/d1aa487722b5a3cab9b222b85fdb5608a5a550c3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:33.569617422Z"}}