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HIGH severity

mPDF Unsafe DeserializationGHSA-3cwc-m7c2-qr86

HIGH

GHSA-3cwc-m7c2-qr86 is a high-severity (CVSS 8.8) Deserialization of Untrusted Data vulnerability in mpdf/mpdf. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for mpdf/mpdf — see the affected versions and patch details below.

Also known asCVE-2019-1000005
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs82th percentile — riskier than 82% of all scored CVEsHighest risk
0.00%0.88%1.76%2.64%0.3%2.1%Jun 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘mpdf/mpdf

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

mPDF version 7.1.7 and earlier contains a CWE-502: Deserialization of Untrusted Data vulnerability in getImage() method of Image/ImageProcessor class that can result in Arbitry code execution, file write, etc.. This attack appears to be exploitable via attacker must host crafted image on victim server and trigger generation of pdf file with content <img src="phar://path/to/crafted/image">. This vulnerability appears to have been fixed in 7.1.8.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmpdf/mpdfall versions7.1.8composer require mpdf/mpdf:^7.1.8

Affected Products

1 product · 1 configurations
Application
mpdfmpdf_project
≤ 7.1.7
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

mPDF version 7.1.7 and earlier contains a CWE-502: Deserialization of Un…

github.comNVDFeb 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mpdf/mpdf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update mpdf/mpdf to 7.1.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3cwc-m7c2-qr86 is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

mPDF version 7.1.7 and earlier contains a CWE-502: Deserialization of Untrusted Data vulnerability in getImage() method of Image/ImageProcessor class that can result in Arbitry code execution, file write, etc.. This attack appears to be exploitable via attacker must host crafted image on victim server and trigger generation of pdf file with content `<img src="phar://path/to/crafted/image">`. This vulnerability appears to have been fixed in 7.1.8.
O3 Security · Impact-Aware SCA

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mPDF Unsafe Deserialization (High 8.8)