diff --git a/crypto/pkcs12/p12_add.c b/crypto/pkcs12/p12_add.c
index 6fd4184af5a52..80ce31b3bca66 100644
--- a/crypto/pkcs12/p12_add.c
+++ b/crypto/pkcs12/p12_add.c
@@ -78,6 +78,12 @@ STACK_OF(PKCS12_SAFEBAG) *PKCS12_unpack_p7data(PKCS7 *p7)
         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_CONTENT_TYPE_NOT_DATA);
         return NULL;
     }
+
+    if (p7->d.data == NULL) {
+        ERR_raise(ERR_LIB_PKCS12, PKCS12_R_DECODE_ERROR);
+        return NULL;
+    }
+
     return ASN1_item_unpack(p7->d.data, ASN1_ITEM_rptr(PKCS12_SAFEBAGS));
 }
 
@@ -150,6 +156,12 @@ STACK_OF(PKCS12_SAFEBAG) *PKCS12_unpack_p7encdata(PKCS7 *p7, const char *pass,
 {
     if (!PKCS7_type_is_encrypted(p7))
         return NULL;
+
+    if (p7->d.encrypted == NULL) {
+        ERR_raise(ERR_LIB_PKCS12, PKCS12_R_DECODE_ERROR);
+        return NULL;
+    }
+
     return PKCS12_item_decrypt_d2i_ex(p7->d.encrypted->enc_data->algorithm,
                                    ASN1_ITEM_rptr(PKCS12_SAFEBAGS),
                                    pass, passlen,
@@ -188,6 +200,12 @@ STACK_OF(PKCS7) *PKCS12_unpack_authsafes(const PKCS12 *p12)
         ERR_raise(ERR_LIB_PKCS12, PKCS12_R_CONTENT_TYPE_NOT_DATA);
         return NULL;
     }
+
+    if (p12->authsafes->d.data == NULL) {
+        ERR_raise(ERR_LIB_PKCS12, PKCS12_R_DECODE_ERROR);
+        return NULL;
+    }
+
     p7s = ASN1_item_unpack(p12->authsafes->d.data,
                            ASN1_ITEM_rptr(PKCS12_AUTHSAFES));
     if (p7s != NULL) {
diff --git a/crypto/pkcs12/p12_mutl.c b/crypto/pkcs12/p12_mutl.c
index 67a885a45f89e..68ff54d0e90ee 100644
--- a/crypto/pkcs12/p12_mutl.c
+++ b/crypto/pkcs12/p12_mutl.c
@@ -98,6 +98,11 @@ static int pkcs12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
         return 0;
     }
 
+    if (p12->authsafes->d.data == NULL) {
+        ERR_raise(ERR_LIB_PKCS12, PKCS12_R_DECODE_ERROR);
+        return 0;
+    }
+
     salt = p12->mac->salt->data;
     saltlen = p12->mac->salt->length;
     if (p12->mac->iter == NULL)
diff --git a/crypto/pkcs12/p12_npas.c b/crypto/pkcs12/p12_npas.c
index 62230bc6187ff..1e5b5495991a4 100644
--- a/crypto/pkcs12/p12_npas.c
+++ b/crypto/pkcs12/p12_npas.c
@@ -77,8 +77,9 @@ static int newpass_p12(PKCS12 *p12, const char *oldpass, const char *newpass)
             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 --git a/crypto/pkcs7/pk7_mime.c b/crypto/pkcs7/pk7_mime.c
index 49a0da5f819c4..8228315eeaa3a 100644
--- a/crypto/pkcs7/pk7_mime.c
+++ b/crypto/pkcs7/pk7_mime.c
@@ -33,10 +33,13 @@ int SMIME_write_PKCS7(BIO *bio, PKCS7 *p7, BIO *data, int flags)
     int ctype_nid = OBJ_obj2nid(p7->type);
     const PKCS7_CTX *ctx = ossl_pkcs7_get0_ctx(p7);
 
-    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;
 
diff --git a/test/recipes/80-test_pkcs12.t b/test/recipes/80-test_pkcs12.t
index 1f0cb4d501488..b2c376249646d 100644
--- a/test/recipes/80-test_pkcs12.t
+++ b/test/recipes/80-test_pkcs12.t
@@ -9,7 +9,7 @@
 use strict;
 use warnings;
 
-use OpenSSL::Test qw/:DEFAULT srctop_file/;
+use OpenSSL::Test qw/:DEFAULT srctop_file with/;
 use OpenSSL::Test::Utils;
 
 use Encode;
@@ -54,7 +54,7 @@ if (eval { require Win32::API; 1; }) {
 }
 $ENV{OPENSSL_WIN32_UTF8}=1;
 
-plan tests => 13;
+plan tests => 17;
 
 # Test different PKCS#12 formats
 ok(run(test(["pkcs12_format_test"])), "test pkcs12 formats");
@@ -148,4 +148,25 @@ ok(grep(/subject=CN = server.example/, @pkcs12info) == 1,
 # Test that the expected friendly name is present in the output
 ok(grep(/testname/, @pkcs12info) == 1, "test friendly name in output");
 
+# Test some bad pkcs12 files
+my $bad1 = srctop_file("test", "recipes", "80-test_pkcs12_data", "bad1.p12");
+my $bad2 = srctop_file("test", "recipes", "80-test_pkcs12_data", "bad2.p12");
+my $bad3 = srctop_file("test", "recipes", "80-test_pkcs12_data", "bad3.p12");
+
+with({ exit_checker => sub { return shift == 1; } },
+     sub {
+        ok(run(app(["openssl", "pkcs12", "-in", $bad1, "-password", "pass:"])),
+           "test bad pkcs12 file 1");
+
+        ok(run(app(["openssl", "pkcs12", "-in", $bad1, "-password", "pass:",
+                    "-nomacver"])),
+           "test bad pkcs12 file 1 (nomacver)");
+
+        ok(run(app(["openssl", "pkcs12", "-in", $bad2, "-password", "pass:"])),
+           "test bad pkcs12 file 2");
+
+        ok(run(app(["openssl", "pkcs12", "-in", $bad3, "-password", "pass:"])),
+           "test bad pkcs12 file 3");
+     });
+
 SetConsoleOutputCP($savedcp) if (defined($savedcp));
diff --git a/test/recipes/80-test_pkcs12_data/bad1.p12 b/test/recipes/80-test_pkcs12_data/bad1.p12
new file mode 100644
index 0000000000000000000000000000000000000000..8f3387c7e356e4aa374729f3f3939343557b9c09
GIT binary patch
literal 85
zcmV-b0IL5mQvv}4Fbf6=Duzgg_YDCD0Wd)@F)$4V31Egu0c8UO0s#d81R(r{)waiY
rfR=Py6XX<mRyon58xHv)BAVy}k(l(hJwF5pk-=q7<yb@T0s;sC$etR(

literal 0
HcmV?d00001

diff --git a/test/recipes/80-test_pkcs12_data/bad2.p12 b/test/recipes/80-test_pkcs12_data/bad2.p12
new file mode 100644
index 0000000000000000000000000000000000000000..113cb6f1cd523e880db869f518e60142dc875115
GIT binary patch
literal 104
zcmXp=V`5}BkYnT2YV&CO&dbQoxImDF-+<SE8zIDI;AmiIz{|#&(B{FI%FM#V$jZQ?
z@Tpc|>#<$m7-wj)xrauuD`}hF=<J_T`^8$QMBK7d>Ng9=0`~S~)@=J%OiUaM0Oze6
AD*ylh

literal 0
HcmV?d00001

diff --git a/test/recipes/80-test_pkcs12_data/bad3.p12 b/test/recipes/80-test_pkcs12_data/bad3.p12
new file mode 100644
index 0000000000000000000000000000000000000000..ef86a1d86fb0bc09471ca2596d82e7d521d973a4
GIT binary patch
literal 104
zcmXp=V`5}BkYnT2YV&CO&dbQoxImDF-+<SE8%fB((ZJAvmyI)_&4V$OnT3gwm4QWp
zJ2GXlSm>oA$5$MVJL*60=F*5iN*C_e&wD%dwCM*q{=+OBX|Z+F7XSHN#>B+I003La
BAqM~e

literal 0
HcmV?d00001