How many CVEs have patched Sniffer?

1 published CVEs changed Sniffer in python/cpython, in 1 distinct patches totalling 485 changed lines, between 2026 and 2026.

What is the latest CVE that changed Sniffer?

CVE-2026-18503 (Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()), published 2026-08-10, changed lines 236 to 577 of Lib/csv.py.

How does Sniffer compare to the rest of python/cpython?

python/cpython has 118 CVEs with a located fix in total; 1 of them changed Sniffer.

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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Sniffer

Sniffer in python/cpython: Patched by 1 CVEs

python/cpython

Class

Sniffer

Name: Sniffer in python/cpython: CVE fixes
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

Lib/csv.py

Last patched August 10, 2026

CVEs

That changed this function

Distinct patches

Backports counted once

485

Lines changed

Added plus removed

2026

Years

By CVE publication date

Overview

Sniffer in python/cpython was changed by 1 published CVE fixes in 2026, in 1 distinct patches that added or removed 485 lines in total.

python/cpython has 118 CVEs with a located fix in total, so 1% of them touched this function.

CVEs that patched it

Every published CVE whose fix changed Sniffer, 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

Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()
CVE-2026-18503 · lines 236–577 · +306 −179
Low · CVSS 2.4
EPSS 0.1%2026-08-10

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Other functions in these files

Functions in the same file that CVE fixes also changed.

1_guess_quote_and_delimiterLib/csv.py1 CVEs · 2 patches2026

Other hotspots in the repository

Functions in python/cpython changed by the most CVE fixes.

makelink_with_filter9 CVEs · Lib/tarfile.py _get_filtered_attrs7 CVEs · Lib/tarfile.py extract6 CVEs · Lib/tarfile.py _get_sep5 CVEs · Lib/posixpath.py _readlink_deep5 CVEs · Lib/ntpath.py _get_bothseps5 CVEs · Lib/ntpath.py

All patched functions in python/cpython

Frequently asked questions

Common questions about CVE fixes to Sniffer.

How many CVEs have patched Sniffer?: 1 published CVEs changed Sniffer in python/cpython, in 1 distinct patches totalling 485 changed lines, between 2026 and 2026.
What is the latest CVE that changed Sniffer?: CVE-2026-18503 (Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()), published 2026-08-10, changed lines 236 to 577 of Lib/csv.py.
How does Sniffer compare to the rest of python/cpython?: python/cpython has 118 CVEs with a located fix in total; 1 of them changed Sniffer.
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

Lib/csv.py on GitHub (opens in a new tab)
All patched functions in python/cpython
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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