OS Command Injection in pontedilana/php-weasyprint (CVE-2026-49260)
Summary
OS command injection in pontedilana/php-weasyprint (CVE-2026-49260). Successful exploitation can lead to full system takeover. Exploitable via master. Mitigation: upgrade to 2.5.1 or later.
Original description
The description as published by the source.
PhpWeasyPrint is a PHP library allowing PDF generation from a URL or an HTML page. Prior to version 2.5.1, pontedilana/php-weasyprint builds the shell command for WeasyPrint by passing the binary path through escapeshellarg() first and then checking the quoted result with is_executable(). On POSIX escapeshellarg('/usr/local/bin/weasyprint') returns '/usr/local/bin/weasyprint' with the single-quote characters as part of the string, so is_executable() looks for a file whose actual name includes those quotes. That file never exists, the "safe" branch is dead code, and the raw $binary string (set via the constructor or setBinary()) flows directly into Symfony\Component\Process\Process::fromShellCommandline(). Any deployment whose binary path is sourced from configuration, an environment variable, or a per-tenant setting reaches a shell-command-injection sink. The library is documented as a one-to-one substitute for KnpLabs/snappy and inherited the exact pre-fix codepath KnpLabs patched in GHSA-vpr4-p6fq-85jc. PhpWeasyPrint version 2.5.1 contains a patch for the issue.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-49260 has been found in pontedilana/php-weasyprint.
Attackers can target a specific entry point like master over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.2/10.
What to do: upgrade pontedilana/php-weasyprint to 2.5.1 or later.
If unsure, ask your IT team or search "pontedilana/php-weasyprint CVE-2026-49260" on the vendor's site.
CVE-2026-49260 (pontedilana/php-weasyprint) — CWE-78 / CVSS v3 8.2
Attack vector: local / no user interaction
Attack surface: master / c2b51fed0bf442c3bf0292b879a09944d436f2a0 / Pdf / buildCommand
Patched: 2.5.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
OS command injection (CWE-78) exists in pontedilana/php-weasyprint. Attackers reach the vulnerable code path via master.
Check the vendor advisory for the affected versions of pontedilana/php-weasyprint. Attack surface: master / c2b51fed0bf442c3bf0292b879a09944d436f2a0 / Pdf / buildCommand.
Severity: High (CVSS 8.2/10). Successful exploitation can lead to full system takeover.
Update to 2.5.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'pontedilana/php-weasyprint' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'pontedilana/php-weasyprint' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
pontedilana/php-weasyprintを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade pontedilana/php-weasyprint to 2.5.1ステージング環境で 2.5.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- patch github.com
- web github.com
- web github.com