Vulnerability record · CVE-2026-102997 · published 30 September 2026

CVE-2026-102997: Uncontrolled resource consumption vulnerability

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.

8.7 CVSS 4.0 High CWE-400 · Uncontrolled resource consumptionCWE-407 · CWE-407 Awaiting Analysis

8.7CVSS 4.0 base score

-EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

4References

1 Oct 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
https://github.com/py-pdf/pypdf/commit/d9d38cf99b115deb562d3b68f36c33027bc04f79
https://github.com/py-pdf/pypdf/pull/4073
https://github.com/py-pdf/pypdf/releases/tag/6.18.1
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jw7q-gvrg-4vj3

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Source: NIST National Vulnerability Database (record CVE-2026-102997), CISA KEV, FIRST EPSS. This page is refreshed as NVD updates the record.