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CVE-2025-66019

6.6 medium SSVC exploitation: none Deferred
NVD · CVE.org

pypdf is a free and open-source pure-python PDF library. Prior to version 6.4.0, an attacker who uses this vulnerability can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter. This issue has been patched in version 6.4.0.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 6.6NVD modified 2026-10-19 13:10

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 4