How many CVEs have patched _check_mapping_size?

1 published CVEs changed _check_mapping_size in py-pdf/pypdf, in 2 distinct patches totalling 9 changed lines, between 2026 and 2026.

What is the latest CVE that changed _check_mapping_size?

CVE-2026-27025 (pypdf has possible long runtimes/large memory usage for large /ToUnicode streams), published 2026-02-20, changed lines 221 to 229 of pypdf/_cmap.py.

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

py-pdf/pypdf has 52 CVEs with a located fix in total; 1 of them changed _check_mapping_size.

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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py-pdf/pypdf

Function

_check_mapping_size

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

pypdf/_cmap.py

Last patched February 20, 2026

1

CVEs

That changed this function

2

Distinct patches

Backports counted once

9

Lines changed

Added plus removed

2026

Years

By CVE publication date

Overview

_check_mapping_size in py-pdf/pypdf was changed by 1 published CVE fixes in 2026, in 2 distinct patches that added or removed 9 lines in total.

py-pdf/pypdf has 52 CVEs with a located fix in total, so 2% of them touched this function.

CVEs that patched it

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

pypdf has possible long runtimes/large memory usage for large /ToUnicode streams
CVE-2026-27025 · lines 221–229 · +9 −0
Medium · CVSS 6.9
EPSS 0.2%2026-02-20

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Other functions in these files

Functions in the same file that CVE fixes also changed.

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 decompress3 CVEs · pypdf/filters.py _get_outline3 CVEs · pypdf/_doc_common.py _flatten3 CVEs · pypdf/_doc_common.py _extract_text3 CVEs · pypdf/_page.py

All patched functions in py-pdf/pypdf

Frequently asked questions

Common questions about CVE fixes to _check_mapping_size.

How many CVEs have patched _check_mapping_size?: 1 published CVEs changed _check_mapping_size in py-pdf/pypdf, in 2 distinct patches totalling 9 changed lines, between 2026 and 2026.
What is the latest CVE that changed _check_mapping_size?: CVE-2026-27025 (pypdf has possible long runtimes/large memory usage for large /ToUnicode streams), published 2026-02-20, changed lines 221 to 229 of pypdf/_cmap.py.
How does _check_mapping_size compare to the rest of py-pdf/pypdf?: py-pdf/pypdf has 52 CVEs with a located fix in total; 1 of them changed _check_mapping_size.
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

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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