diff -Naur a/crypto/pkcs12/p12_add.c b/crypto/pkcs12/p12_add.c
--- a/crypto/pkcs12/p12_add.c	2024-02-02 15:39:27.287368573 +0800
+++ b/crypto/pkcs12/p12_add.c	2024-02-02 15:38:30.271860109 +0800
@@ -76,6 +76,12 @@
                   PKCS12_R_CONTENT_TYPE_NOT_DATA);
         return NULL;
     }
+    
+    if (p7->d.data == NULL) {
+        PKCS12err(PKCS12_F_PKCS12_UNPACK_P7DATA, PKCS12_R_DECODE_ERROR);
+        return NULL;
+    }
+
     return ASN1_item_unpack(p7->d.data, ASN1_ITEM_rptr(PKCS12_SAFEBAGS));
 }
 
@@ -132,6 +138,11 @@
 {
     if (!PKCS7_type_is_encrypted(p7))
         return NULL;
+
+    if (p7->d.encrypted == NULL) {
+        return NULL;
+    }
+
     return PKCS12_item_decrypt_d2i(p7->d.encrypted->enc_data->algorithm,
                                    ASN1_ITEM_rptr(PKCS12_SAFEBAGS),
                                    pass, passlen,
@@ -159,6 +170,11 @@
                   PKCS12_R_CONTENT_TYPE_NOT_DATA);
         return NULL;
     }
+    if (p12->authsafes->d.data == NULL) {
+        PKCS12err(PKCS12_F_PKCS12_UNPACK_AUTHSAFES, PKCS12_R_DECODE_ERROR);
+        return NULL;
+    }
+
     return ASN1_item_unpack(p12->authsafes->d.data,
                             ASN1_ITEM_rptr(PKCS12_AUTHSAFES));
 }
diff -Naur a/crypto/pkcs12/p12_mutl.c b/crypto/pkcs12/p12_mutl.c
--- a/crypto/pkcs12/p12_mutl.c	2024-02-02 15:39:27.287368573 +0800
+++ b/crypto/pkcs12/p12_mutl.c	2024-02-02 15:38:30.271860109 +0800
@@ -93,6 +93,11 @@
         return 0;
     }
 
+    if (p12->authsafes->d.data == NULL) {
+        PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_DECODE_ERROR);
+        return 0;
+    }
+
     salt = p12->mac->salt->data;
     saltlen = p12->mac->salt->length;
     if (!p12->mac->iter)
diff -Naur a/crypto/pkcs12/p12_npas.c b/crypto/pkcs12/p12_npas.c
--- a/crypto/pkcs12/p12_npas.c	2024-02-02 15:39:27.287368573 +0800
+++ b/crypto/pkcs12/p12_npas.c	2024-02-02 15:38:30.271860109 +0800
@@ -78,8 +78,9 @@
             bags = PKCS12_unpack_p7data(p7);
         } else if (bagnid == NID_pkcs7_encrypted) {
             bags = PKCS12_unpack_p7encdata(p7, oldpass, -1);
-            if (!alg_get(p7->d.encrypted->enc_data->algorithm,
-                         &pbe_nid, &pbe_iter, &pbe_saltlen))
+            if (p7->d.encrypted == NULL
+                    || !alg_get(p7->d.encrypted->enc_data->algorithm,
+                                &pbe_nid, &pbe_iter, &pbe_saltlen))
                 goto err;
         } else {
             continue;
diff -Naur a/crypto/pkcs7/pk7_mime.c b/crypto/pkcs7/pk7_mime.c
--- a/crypto/pkcs7/pk7_mime.c	2024-02-02 15:39:27.280368511 +0800
+++ b/crypto/pkcs7/pk7_mime.c	2024-02-02 15:38:30.263860038 +0800
@@ -30,10 +30,14 @@
 {
     STACK_OF(X509_ALGOR) *mdalgs;
     int ctype_nid = OBJ_obj2nid(p7->type);
-    if (ctype_nid == NID_pkcs7_signed)
+
+    if (ctype_nid == NID_pkcs7_signed) {
+        if (p7->d.sign == NULL)
+            return 0;
         mdalgs = p7->d.sign->md_algs;
-    else
+    } else {
         mdalgs = NULL;
+    }
 
     flags ^= SMIME_OLDMIME;