From 0d4498d71d56bfff149932f3ec63b65aee41943d Mon Sep 17 00:00:00 2001
From: sobolevn <mail@sobolevn.me>
Date: Tue, 23 Jun 2026 17:30:41 +0300
Subject: [PATCH] gh-151763: Fix `_interpreters.capture_exception` crash on
 memory errors

---
 .../Library/2026-06-23-17-30-16.gh-issue-151763.-sTnNi.rst    | 2 ++
 Modules/_interpretersmodule.c                                 | 4 +++-
 Python/crossinterp.c                                          | 1 +
 3 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2026-06-23-17-30-16.gh-issue-151763.-sTnNi.rst

diff --git a/Misc/NEWS.d/next/Library/2026-06-23-17-30-16.gh-issue-151763.-sTnNi.rst b/Misc/NEWS.d/next/Library/2026-06-23-17-30-16.gh-issue-151763.-sTnNi.rst
new file mode 100644
index 00000000000000..09e423da0c591e
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-23-17-30-16.gh-issue-151763.-sTnNi.rst
@@ -0,0 +1,2 @@
+Fix a crash in :func:`!_interpreters.capture_exception` when
+:exc:`MemoryError` happens.
diff --git a/Modules/_interpretersmodule.c b/Modules/_interpretersmodule.c
index e7a91ced48f176..d024dee906ded3 100644
--- a/Modules/_interpretersmodule.c
+++ b/Modules/_interpretersmodule.c
@@ -1541,7 +1541,9 @@ _interpreters_capture_exception_impl(PyObject *module, PyObject *exc_arg)
     }
 
 finally:
-    _PyXI_FreeExcInfo(info);
+    if (info != NULL) {
+        _PyXI_FreeExcInfo(info);
+    }
     if (exc != exc_arg) {
         if (PyErr_Occurred()) {
             PyErr_SetRaisedException(exc);
diff --git a/Python/crossinterp.c b/Python/crossinterp.c
index 6b489bf03f86ec..d52ad4145388ba 100644
--- a/Python/crossinterp.c
+++ b/Python/crossinterp.c
@@ -1689,6 +1689,7 @@ _PyXI_NewExcInfo(PyObject *exc)
     }
     _PyXI_excinfo *info = PyMem_RawCalloc(1, sizeof(_PyXI_excinfo));
     if (info == NULL) {
+        PyErr_NoMemory();
         return NULL;
     }
     const char *failure;