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Vulnerability record · CVE-2026-49286 · published 19 June 2026

CVE-2026-49286: Deserialization of untrusted data vulnerability

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.

8.1 CVSS 3.1 High EPSS 0.95% · top 40.3% CWE-502 · Deserialization of untrusted data Deferred
8.1CVSS 3.1 base score
0.95%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
22 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/KnpLabs/snappy/security/advisories/GHSA-92rv-4j2h-8mjj
https://github.com/pontedilana/php-weasyprint/commit/d1aa487722b5a3cab9b222b85fdb5608a5a550c3
https://github.com/pontedilana/php-weasyprint/releases/tag/2.6.0
https://github.com/pontedilana/php-weasyprint/security/advisories/GHSA-2fmj-p74r-3wjm
https://github.com/pontedilana/php-weasyprint/security/advisories/GHSA-2fmj-p74r-3wjm

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Source: NIST National Vulnerability Database (record CVE-2026-49286), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.