PT-2026-103588 · Py Pdf · Pypdf

CVE-2026-102997

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Published

2026-09-30

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Updated

2026-09-30

CVSS v4.0

8.7

High

VectorAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF containing a partially malformed /FlateDecode stream with padded data can force pypdf/filters.py to use inefficient byte-by-byte decompression while the earlier recovery counter fails to advance for bytes that successfully decode, causing long runtimes and application unavailability. This is a residual issue after the malformed FlateDecode recovery fix. This issue is fixed in version 6.18.1.

Fix

Resource Exhaustion

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Weakness Enumeration

CWE-407CWE-400

Related Identifiers

CVE-2026-102997

Affected Products

Pypdf