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GeezerVison is showing github.com — [3.13] gh-160369: Discard cached responses after IMAP STARTTLS (GH-160370) by JelleZijlstra · Pull Request #161759 · python/cpython

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@JelleZijlstra

@JelleZijlstra JelleZijlstra commented Nov 10, 2026 •
edited by bedevere-app Bot
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Backport of gh-160370 to 3.13.

Clear cached untagged responses when upgrading to TLS. This branch uses a buffered file that is replaced during STARTTLS, so the main-branch _readbuf check does not apply. Preserve the STARTTLS integration coverage and adjust the NEWS entry accordingly.

  • Issue: Reject buffered plaintext after IMAP STARTTLS #160369

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@JelleZijlstra @sethmlarson @hugovk
pythongh-160369: Reject buffered plaintext after IMAP STARTTLS (pytho…
977eaa6 
…n#160370)

Co-authored-by: Seth Michael Larson <[email protected]>
Co-authored-by: Hugo van Kemenade <[email protected]>
(cherry picked from commit 2f0e294)
@JelleZijlstra
JelleZijlstra requested a review from a team as a code owner November 10, 2026 17:17
@bedevere-app bedevere-app Bot mentioned this pull request Nov 10, 2026
gh-160369: Reject buffered plaintext after IMAP STARTTLS #160370
Merged
@bedevere-app bedevere-app Bot added the type-security A security issue label Nov 10, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Nov 10, 2026
Reject buffered plaintext after IMAP STARTTLS #160369
Open
@bedevere-app bedevere-app Bot added the awaiting core review label Nov 10, 2026
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@JelleZijlstra
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