How many CVEs have patched decompress?

3 published CVEs changed decompress in py-pdf/pypdf, in 5 distinct patches totalling 101 changed lines, between 2025 and 2026.

What is the latest CVE that changed decompress?

CVE-2026-102997 (pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)), published 2026-09-30, changed lines 147 to 173 of pypdf/filters.py.

How does decompress compare to the rest of py-pdf/pypdf?

py-pdf/pypdf has 52 CVEs with a located fix in total; 3 of them changed decompress.

What do the line numbers refer to?

Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

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Decompress

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Patched Functions
Py Pdf
Pypdf
Decompress

decompress in py-pdf/pypdf: Patched by 3 CVEs

py-pdf/pypdf

Function

decompress

Name: decompress in py-pdf/pypdf: CVE fixes
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

pypdf/filters.py

Last patched September 30, 2026

CVEs

That changed this function

Distinct patches

Backports counted once

101

Lines changed

Added plus removed

2025–2026

Years

By CVE publication date

Overview

decompress in py-pdf/pypdf was changed by 3 published CVE fixes between 2025 and 2026, in 5 distinct patches that added or removed 101 lines in total.

py-pdf/pypdf has 52 CVEs with a located fix in total, so 6% of them touched this function.

CVEs that patched it

Every published CVE whose fix changed decompress, newest first, with the lines each fix touched.

On this page

Overview
CVEs that patched it
Other functions in these files
Other hotspots in the repository
FAQ
References

pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)
CVE-2026-102997 · lines 147–173 · +8 −7
High · CVSS 8.7
EPSS 0.3%2026-09-30
pypdf possibly has long runtimes for malformed FlateDecode streams
CVE-2026-27026 · lines 139–155 · +9 −4
Medium · CVSS 6.9
EPSS 0.2%2026-02-20
pypdf's Manipulated FlateDecode streams can exhaust RAM
CVE-2025-55197 · lines 93–143 · +42 −31 in 2 hunks
Medium · CVSS 6.6
EPSS 0.5%2025-08-13

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Other functions in these files

Functions in the same file that CVE fixes also changed.

1decodepypdf/filters.py5 CVEs · 8 patches2025 to 2026
2_decompress_with_limitpypdf/filters.py4 CVEs · 6 patches2025 to 2026
3_decode_png_predictionpypdf/filters.py3 CVEs · 3 patches2026
4decode_stream_datapypdf/filters.py1 CVEs · 1 patches2025

Other hotspots in the repository

Functions in py-pdf/pypdf changed by the most CVE fixes.

decode5 CVEs · pypdf/filters.py _decompress_with_limit4 CVEs · pypdf/filters.py _get_outline3 CVEs · pypdf/_doc_common.py _flatten3 CVEs · pypdf/_doc_common.py _extract_text3 CVEs · pypdf/_page.py extract_xform_text3 CVEs · pypdf/_page.py

All patched functions in py-pdf/pypdf

Frequently asked questions

Common questions about CVE fixes to decompress.

How many CVEs have patched decompress?: 3 published CVEs changed decompress in py-pdf/pypdf, in 5 distinct patches totalling 101 changed lines, between 2025 and 2026.
What is the latest CVE that changed decompress?: CVE-2026-102997 (pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)), published 2026-09-30, changed lines 147 to 173 of pypdf/filters.py.
How does decompress compare to the rest of py-pdf/pypdf?: py-pdf/pypdf has 52 CVEs with a located fix in total; 3 of them changed decompress.
What do the line numbers refer to?: Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

References

pypdf/filters.py on GitHub (opens in a new tab)
All patched functions in py-pdf/pypdf
Patched functions directory

Fix locations are computed by RadicalNotion.AI from the upstream patch diff of each CVE. CVE data is sourced from the CVE Program.

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