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[3.10] gh-146333: Fix quadratic regex backtracking in configparser option parsing (GH-146399) (GH-148559) by encukou · Pull Request #154878 · python/cpython · GitHub

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[3.10] gh-146333: Fix quadratic regex backtracking in configparser option parsing (GH-146399) (GH-148559) - #154878

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pablogsal merged 2 commits into
python:3.10from
encukou:backport-a5969e8-3.10
Aug 10, 2026
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[3.10] gh-146333: Fix quadratic regex backtracking in configparser option parsing (GH-146399) (GH-148559)#154878
pablogsal merged 2 commits into
python:3.10from
encukou:backport-a5969e8-3.10

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encukou commented Jul 29, 2026
edited by bedevere-app Bot
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Use negative lookahead in option regex to prevent backtracking, and to avoid changing logic outside the regexes (since people could use the regex directly).

(cherry picked from commit 7e0a0be)
(cherry picked from commit a5969e8)

…ser option parsing (pythonGH-146399) (pythonGH-148559)

Use negative lookahead in option regex to prevent backtracking, and to avoid changing logic outside the regexes (since people could use the regex directly).
(cherry picked from commit 7e0a0be)

Co-authored-by: Joshua Swanson <22283299+joshuaswanson@users.noreply.github.com>
(cherry picked from commit a5969e8)
pablogsal merged commit 0e14e5d into python:3.10 Aug 10, 2026
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