PhpWeasyPrint vulnerable to arbitrary file deletion at shutdown via public $temporaryFiles

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-49358: 0.17% estimated exploitation activity in the next 30 days; percentile 5.83 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary AbstractGenerator::$temporaryFiles is a public array, and removeTemporaryFiles() — invoked from destruct() and from a registered shutdown function — calls unlink() on every entry without verifying that the path is contained within the temporary folder. Any code holding a reference to a generator instance can push an arbitrary path into the array and have it deleted on script shutdown. This mirrors the KnpLabs/snappy issue GHSA-87qc-37cw-84h4, patched in snappy 1.7.2. Affected versions pontedilana/php-weasyprint versions <= 2.5.1. Patched in: 2.6.0. Vulnerable code src/AbstractGenerator.php: No path-containment check: whatever path is present in $temporaryFiles at shutdown is unlinked. Proof of concept Impact - Arbitrary file deletion bound to script shutdown, scoped to the privileges of the PHP process user. - Not directly exploitable on its own (the attacker already needs to influence the property in the same request). The risk is amplification: chained with a separate…

Published by the source

26 Jun 2026, 22:10 UTC

Last modified by the source

26 Jun 2026, 22:10 UTC

Source last checked

26 Oct 2026, 14:49 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-5g9f-cwwg-4p8g

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# Patch Next advisory brief: CVE-2026-49358

Advisory: PhpWeasyPrint vulnerable to arbitrary file deletion at shutdown via public $temporaryFiles
IDs: CVE-2026-49358, GHSA-5g9f-cwwg-4p8g
Record: https://patchnext.com/advisories/cve-2026-49358 (revision 1, source checked 26 Oct 2026, 14:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: pontedilana/php-weasyprint 2.6.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist pontedilana/php-weasyprint: affected <= 2.5.1; fixed in 2.6.0

## Suggested inspection (read-only)
- Packagist pontedilana/php-weasyprint: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on pontedilana/php-weasyprint.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5g9f-cwwg-4p8g (GitHub-reviewed advisory GHSA-5g9f-cwwg-4p8g lists affected ranges: Packagist pontedilana/php-weasyprint >=0 <=2.5.1)

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