diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.173d49.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.173d49.rst
new file mode 100644
index 000000000000000..a552d06ff7bb898
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-10-19-19-33-35.gh-issue-159739.173d49.rst
@@ -0,0 +1,2 @@
+Avoid a crash if formatting an integer with the ``c`` presentation type runs
+out of memory.
diff --git a/Python/formatter_unicode.c b/Python/formatter_unicode.c
index 30807f428c7d71b..562956fb3e1e5e2 100644
--- a/Python/formatter_unicode.c
+++ b/Python/formatter_unicode.c
@@ -1021,6 +1021,9 @@ format_long_internal(PyObject *value, const InternalFormatSpec *format,
             goto done;
         }
         tmp = PyUnicode_FromOrdinal(x);
+        if (tmp == NULL) {
+            goto done;
+        }
         inumeric_chars = 0;
         n_digits = 1;
         maxchar = Py_MAX(maxchar, (Py_UCS4)x);