gh-72507: Document that imaplib does not verify TLS certificates by default#152778
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serhiy-storchaka merged 1 commit intoJul 2, 2026
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IMAP4_SSL() and IMAP4.starttls() do not verify the server certificate or hostname unless a suitable ssl_context is passed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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needs backport to 3.13
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15. |
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GH-152862 is a backport of this pull request to the 3.15 branch. |
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GH-152863 is a backport of this pull request to the 3.14 branch. |
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GH-152864 is a backport of this pull request to the 3.13 branch. |
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…es by default (GH-152778) (GH-152864) IMAP4_SSL() and IMAP4.starttls() do not verify the server certificate or hostname unless a suitable ssl_context is passed. (cherry picked from commit f3bf8ab) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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…es by default (GH-152778) (GH-152863) IMAP4_SSL() and IMAP4.starttls() do not verify the server certificate or hostname unless a suitable ssl_context is passed. (cherry picked from commit f3bf8ab) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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…es by default (GH-152778) (GH-152862) IMAP4_SSL() and IMAP4.starttls() do not verify the server certificate or hostname unless a suitable ssl_context is passed. (cherry picked from commit f3bf8ab) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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IMAP4_SSL()andIMAP4.starttls()fall back tossl._create_stdlib_context()when no ssl_context is given, and thatcontext has
check_hostname=Falseandverify_mode=CERT_NONE-- so withthe default the connection is encrypted but the server certificate and
hostname are not verified. The documentation implied otherwise ("the
class now supports hostname check").
This adds a note to both
IMAP4_SSLandIMAP4.starttlsstating that thedefault does not verify, and pointing to
ssl.create_default_context().Only the documentation is changed; the default behavior is left as-is
(that broader change is tracked in gh-91826).