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del ssl.SSLContext().keylog_filename crashes #156099

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del ssl.SSLContext().keylog_filename crashes#156099
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3.13only security fixes3.14bugs and security fixes3.15bugs and security fixes3.16new features, bugs and security fixesextension-modulesC modules in the Modules dirtopic-SSLtype-crashA hard crash of the interpreter, possibly with a core dump

Description

@serhiy-storchaka
serhiy-storchaka
opened on Aug 20, 2026

Crash report

import ssl
ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT)
del ctx.keylog_filename

_PySSLContext_set_keylog_filename() in Modules/_ssl/debughelpers.c does not check the value for NULL and passes it to Py_fopen().
It should raise an AttributeError instead, like the setters generated by Argument Clinic in Modules/_ssl.c.

The same code is in 3.13, 3.14 and 3.15.

Linked PRs

Activity

  1. serhiy-storchaka
    added
    extension-modulesC modules in the Modules dir
    type-crashA hard crash of the interpreter, possibly with a core dump
    topic-SSL
    3.13only security fixes
    3.14bugs and security fixes
    3.15bugs and security fixes
    3.16new features, bugs and security fixes
    on Aug 20, 2026
  2. serhiy-storchaka
    added a parent issue on Aug 20, 2026
  3. serhiy-storchaka
    added a commit that references this issue on Aug 21, 2026

    gh-156099: Fix a crash when deleting SSLContext.keylog_filename (GH-1…

    5ebd486
  4. serhiy-storchaka
    closed this as completedon Aug 21, 2026
  5. serhiy-storchaka
    added 2 commits that reference this issue on Aug 21, 2026

    [3.14] gh-156099: Fix a crash when deleting SSLContext.keylog_filename (

    de386f2

    [3.13] gh-156099: Fix a crash when deleting SSLContext.keylog_filename (

    6b3d4ea
  6. serhiy-storchaka
    added a commit that references this issue on Oct 9, 2026

    [3.15] gh-156099: Fix a crash when deleting SSLContext.keylog_filename (

    54ffa19
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    3.13only security fixes3.14bugs and security fixes3.15bugs and security fixes3.16new features, bugs and security fixesextension-modulesC modules in the Modules dirtopic-SSLtype-crashA hard crash of the interpreter, possibly with a core dump

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