NVD HIGH: CVE-2026-102997 — pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a craf...

Wednesday, September 30, 2026 at 09:17 PM UTC·Source: NIST NVD

Updated: Monday, October 5, 2026 at 04:00 PM UTC

Executive Summary

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 af

Analysis

Indicators of Compromise (1)

CVE (1)

CVE-2026-102997

NVD MITRE CVE

Source Attribution

Originally published by NIST NVD on Sep 30, 2026. Verified by: NIST.

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