AIKIDO-2026-824799
fpdf2 is vulnerable to Uncontrolled Resource Consumption
65
Medium Risk
This Affects:
fpdf2TL;DR
fpdf2 expands SVG use references by deep-copying the entire referenced graphics tree on each reference. A small crafted SVG can nest use references so the number of in-memory objects grows exponentially during FPDF.image() processing. Rendering such input consumes excessive CPU and memory and can exhaust a PDF generation worker. The fix rejects reference cycles and excessive nested expansion and enforces configurable SVG complexity limits.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application passes untrusted SVG data to FPDF.image().
Background info
fpdf2 is vulnerable to Uncontrolled Resource Consumption in versions 2.5.0 - 2.8.7.
How to fix this
Upgrade the fpdf2 library to the patch version.
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