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[3.14] gh-146333: Fix quadratic regex backtracking in configparser option parsing (GH-146399) - #148287
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gpshead merged 1 commit intoApr 12, 2026
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[3.14] gh-146333: Fix quadratic regex backtracking in configparser option parsing (GH-146399)#148287gpshead merged 1 commit into
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…ion parsing (pythonGH-146399) 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>
mandree
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Add a -flto=full option, which can speed up the port build in terms of wallclock time at the expense of overall more CPU time. Issue a warning that test_ssl will fail from pre-test if DEBUG is enabled. Changelog: https://docs.python.org/release/3.14.4/whatsnew/changelog.html Which contains these security fixes: pyexpat.c: Unbounded C recursion in conv_content_model causes crash Security: python/cpython#145986 which is the same as Security: CVE-2026-4224 Reject control characters in more places in http.cookies.Morsel Security: python/cpython#145599 which is the same as Security: CVE-2026-3644 SourcelessFileLoader does not use io.open_code() Security: python/cpython#145506 which is the same as Security: CVE-2026-2297 [security] Disallow usage of control characters in status, headers and values for security in Lib/wsgiref/handlers.py Security: python/cpython#144370 Reject leading dashes in webbrowser.open() Security: python/cpython#143930 which is the same as Security: 9fdad262-2e0f-11f1-88c7-00a098b42aeb which is the same as Security: CVE-2026-4519 Excess Base64 data ignored after padding by default Security: python/cpython#145264 which is the same as Security: CVE-2026-3446 Added into PORTREVISION=1: 2 cherry-picks post-3.14.4 HTTP proxy via "CONNECT" tunneling doesn't sanitize CR/LF Obtained from: python/cpython#148342 Security: python/cpython#146212 Security: CVE-2026-1502 configparser.RawConfigParser.{OPTCRE,OPTCRE_NV} regexes vulnerable to quadratic backtracking Obtained from: python/cpython#148287 Security: python/cpython#146333 lang/python314: add FULLLTO and warning
mandree
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Apr 11, 2026
Add a -flto=full option, which can speed up the port build in terms of wallclock time at the expense of overall more CPU time. Issue a warning that test_ssl will fail from pre-test if DEBUG is enabled. Changelog: https://docs.python.org/release/3.14.4/whatsnew/changelog.html Which contains these security fixes: pyexpat.c: Unbounded C recursion in conv_content_model causes crash Security: python/cpython#145986 which is the same as Security: CVE-2026-4224 Reject control characters in more places in http.cookies.Morsel Security: python/cpython#145599 which is the same as Security: CVE-2026-3644 SourcelessFileLoader does not use io.open_code() Security: python/cpython#145506 which is the same as Security: CVE-2026-2297 [security] Disallow usage of control characters in status, headers and values for security in Lib/wsgiref/handlers.py Security: python/cpython#144370 Reject leading dashes in webbrowser.open() Security: python/cpython#143930 which is the same as Security: 9fdad262-2e0f-11f1-88c7-00a098b42aeb which is the same as Security: CVE-2026-4519 Excess Base64 data ignored after padding by default Security: python/cpython#145264 which is the same as Security: CVE-2026-3446 Added into PORTREVISION=1: 2 cherry-picks post-3.14.4 HTTP proxy via "CONNECT" tunneling doesn't sanitize CR/LF Obtained from: python/cpython#148342 Security: python/cpython#146212 Security: CVE-2026-1502 configparser.RawConfigParser.{OPTCRE,OPTCRE_NV} regexes vulnerable to quadratic backtracking Obtained from: python/cpython#148287 Security: python/cpython#146333 lang/python314: add FULLLTO and warning (cherry picked from commit b526f87)
gpshead
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Apr 12, 2026
gpshead
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April 12, 2026 00:05
freebsd-git
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Apr 12, 2026
Add a -flto=full option, which can speed up the port build in terms of wallclock time at the expense of overall more CPU time. Issue a warning that test_ssl will fail from pre-test if DEBUG is enabled. Changelog: https://docs.python.org/release/3.14.4/whatsnew/changelog.html PR: 294324 Which contains these security fixes: pyexpat.c: Unbounded C recursion in conv_content_model causes crash Security: python/cpython#145986 / CVE-2026-4224 Reject control characters in more places in http.cookies.Morsel Security: python/cpython#145599 / CVE-2026-3644 SourcelessFileLoader does not use io.open_code() Security: python/cpython#145506 / CVE-2026-2297 Disallow usage of control characters in status, headers and values for security in Lib/wsgiref/handlers.py Security: python/cpython#144370 Reject leading dashes in webbrowser.open() Security: python/cpython#143930 / 9fdad262-2e0f-11f1-88c7-00a098b42aeb / CVE-2026-4519 Excess Base64 data ignored after padding by default Security: python/cpython#145264 / CVE-2026-3446 Additional security related PRs from upstream HTTP proxy via "CONNECT" tunneling doesn't sanitize CR/LF Obtained from: python/cpython#148342 Security python/cpython#146212 / CVE-2026-1502 configparser.RawConfigParser.{OPTCRE,OPTCRE_NV} regexes vulnerable to quadratic backtracking Obtained from: python/cpython#148287 Security: python/cpython#146333
freebsd-git
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Apr 12, 2026
Add a -flto=full option, which can speed up the port build in terms of wallclock time at the expense of overall more CPU time. Issue a warning that test_ssl will fail from pre-test if DEBUG is enabled. Changelog: https://docs.python.org/release/3.14.4/whatsnew/changelog.html PR: 294324 Which contains these security fixes: pyexpat.c: Unbounded C recursion in conv_content_model causes crash Security: python/cpython#145986 / CVE-2026-4224 Reject control characters in more places in http.cookies.Morsel Security: python/cpython#145599 / CVE-2026-3644 SourcelessFileLoader does not use io.open_code() Security: python/cpython#145506 / CVE-2026-2297 Disallow usage of control characters in status, headers and values for security in Lib/wsgiref/handlers.py Security: python/cpython#144370 Reject leading dashes in webbrowser.open() Security: python/cpython#143930 / 9fdad262-2e0f-11f1-88c7-00a098b42aeb / CVE-2026-4519 Excess Base64 data ignored after padding by default Security: python/cpython#145264 / CVE-2026-3446 Additional security related PRs from upstream HTTP proxy via "CONNECT" tunneling doesn't sanitize CR/LF Obtained from: python/cpython#148342 Security python/cpython#146212 / CVE-2026-1502 configparser.RawConfigParser.{OPTCRE,OPTCRE_NV} regexes vulnerable to quadratic backtracking Obtained from: python/cpython#148287 Security: python/cpython#146333 (cherry picked from commit 955268b)
camachat
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Jul 22, 2026
Add a -flto=full option, which can speed up the port build in terms of wallclock time at the expense of overall more CPU time. Issue a warning that test_ssl will fail from pre-test if DEBUG is enabled. Changelog: https://docs.python.org/release/3.14.4/whatsnew/changelog.html PR: 294324 Which contains these security fixes: pyexpat.c: Unbounded C recursion in conv_content_model causes crash Security: python/cpython#145986 / CVE-2026-4224 Reject control characters in more places in http.cookies.Morsel Security: python/cpython#145599 / CVE-2026-3644 SourcelessFileLoader does not use io.open_code() Security: python/cpython#145506 / CVE-2026-2297 Disallow usage of control characters in status, headers and values for security in Lib/wsgiref/handlers.py Security: python/cpython#144370 Reject leading dashes in webbrowser.open() Security: python/cpython#143930 / 9fdad262-2e0f-11f1-88c7-00a098b42aeb / CVE-2026-4519 Excess Base64 data ignored after padding by default Security: python/cpython#145264 / CVE-2026-3446 Additional security related PRs from upstream HTTP proxy via "CONNECT" tunneling doesn't sanitize CR/LF Obtained from: python/cpython#148342 Security python/cpython#146212 / CVE-2026-1502 configparser.RawConfigParser.{OPTCRE,OPTCRE_NV} regexes vulnerable to quadratic backtracking Obtained from: python/cpython#148287 Security: python/cpython#146333
camachat
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Jul 24, 2026
Add a -flto=full option, which can speed up the port build in terms of wallclock time at the expense of overall more CPU time. Issue a warning that test_ssl will fail from pre-test if DEBUG is enabled. Changelog: https://docs.python.org/release/3.14.4/whatsnew/changelog.html PR: 294324 Which contains these security fixes: pyexpat.c: Unbounded C recursion in conv_content_model causes crash Security: python/cpython#145986 / CVE-2026-4224 Reject control characters in more places in http.cookies.Morsel Security: python/cpython#145599 / CVE-2026-3644 SourcelessFileLoader does not use io.open_code() Security: python/cpython#145506 / CVE-2026-2297 Disallow usage of control characters in status, headers and values for security in Lib/wsgiref/handlers.py Security: python/cpython#144370 Reject leading dashes in webbrowser.open() Security: python/cpython#143930 / 9fdad262-2e0f-11f1-88c7-00a098b42aeb / CVE-2026-4519 Excess Base64 data ignored after padding by default Security: python/cpython#145264 / CVE-2026-3446 Additional security related PRs from upstream HTTP proxy via "CONNECT" tunneling doesn't sanitize CR/LF Obtained from: python/cpython#148342 Security python/cpython#146212 / CVE-2026-1502 configparser.RawConfigParser.{OPTCRE,OPTCRE_NV} regexes vulnerable to quadratic backtracking Obtained from: python/cpython#148287 Security: python/cpython#146333
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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)
Co-authored-by: Joshua Swanson 22283299+joshuaswanson@users.noreply.github.com