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[3.13] gh-144833: Fix use-after-free in SSL module when SSL_new() fails (GH-144843) #144859

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Merged
gpshead merged 1 commit into from
Feb 16, 2026
+4 −1
Merged

[3.13] gh-144833: Fix use-after-free in SSL module when SSL_new() fails (GH-144843) #144859

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gh-144833: Fix use-after-free in SSL module when SSL_new() fails (GH-… 
…144843)

In newPySSLSocket(), when SSL_new() returns NULL, Py_DECREF(self)
was called before _setSSLError(get_state_ctx(self), ...), causing
a use-after-free. Additionally, get_state_ctx() was called with
self (PySSLSocket*) instead of sslctx (PySSLContext*), which is
a type confusion bug.

Fix by calling _setSSLError() before Py_DECREF() and using
sslctx instead of self for get_state_ctx().
(cherry picked from commit c91638c)

Co-authored-by: Ramin Farajpour Cami <[email protected]>
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@raminfp @miss-islington
raminfp authored and miss-islington committed Feb 16, 2026
commit e795673bc8860904bb7047555c98aee321975794
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-02-15-00-00-00.gh-issue-144833.TUelo1.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fixed a use-after-free in :mod:`ssl` when ``SSL_new()`` returns NULL in
``newPySSLSocket()``. The error was reported via a dangling pointer after the
object had already been freed.
2 changes: 1 addition & 1 deletion Modules/_ssl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -851,8 +851,8 @@ newPySSLSocket(PySSLContext *sslctx, PySocketSockObject *sock,
self->ssl = SSL_new(ctx);
PySSL_END_ALLOW_THREADS(sslctx)
if (self->ssl == NULL) {
_setSSLError(get_state_ctx(sslctx), NULL, 0, __FILE__, __LINE__);
Py_DECREF(self);
_setSSLError(get_state_ctx(self), NULL, 0, __FILE__, __LINE__);
return NULL;
}

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