Bug 2544294 (CVE-2026-102997) - CVE-2026-102997 pypdf: pypdf: Denial of Service via crafted FlateDecode stream
Summary: CVE-2026-102997 pypdf: pypdf: Denial of Service via crafted FlateDecode stream
Keywords:
Status: NEW
Alias: CVE-2026-102997
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-30 20:33 UTC by OSIDB Bzimport
Modified: 2026-10-01 18:04 UTC (History)
24 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-30 20:33:48 UTC 
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.
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