diff --git a/crypto/ec/ec_backend.c b/crypto/ec/ec_backend.c

index bea01fb38f66..48721369ae8f 100644

--- a/crypto/ec/ec_backend.c

+++ b/crypto/ec/ec_backend.c

@@ -318,6 +318,11 @@ int ossl_ec_group_todata(const EC_GROUP *group, OSSL_PARAM_BLD *tmpl,

         return 0;

     }

+    if (!ossl_param_build_set_int(tmpl, params,

+                                  OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS,

+                                  group->decoded_from_explicit_params))

+        return 0;

+

     curve_nid = EC_GROUP_get_curve_name(group);

     /*

diff --git a/crypto/ec/ec_lib.c b/crypto/ec/ec_lib.c

index 6b0591c6c8c7..b1696d93bd6d 100644

--- a/crypto/ec/ec_lib.c

+++ b/crypto/ec/ec_lib.c

@@ -1556,13 +1556,23 @@ EC_GROUP *EC_GROUP_new_from_params(const OSSL_PARAM params[],

     /* This is the simple named group case */

     ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME);

     if (ptmp != NULL) {

-        group = group_new_from_name(ptmp, libctx, propq);

-        if (group != NULL) {

-            if (!ossl_ec_group_set_params(group, params)) {

-                EC_GROUP_free(group);

-                group = NULL;

-            }

+        int decoded = 0;

+

+        if ((group = group_new_from_name(ptmp, libctx, propq)) == NULL)

+            return NULL;

+        if (!ossl_ec_group_set_params(group, params)) {

+            EC_GROUP_free(group);

+            return NULL;

+        }

+

+        ptmp = OSSL_PARAM_locate_const(params,

+                                       OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS);

+        if (ptmp != NULL && !OSSL_PARAM_get_int(ptmp, &decoded)) {

+            ERR_raise(ERR_LIB_EC, EC_R_WRONG_CURVE_PARAMETERS);

+            EC_GROUP_free(group);

+            return NULL;

         }

+        group->decoded_from_explicit_params = decoded > 0;

         return group;

     }

 #ifdef FIPS_MODULE

@@ -1733,6 +1743,8 @@ EC_GROUP *EC_GROUP_new_from_params(const OSSL_PARAM params[],

         EC_GROUP_free(group);

         group = named_group;

     }

+    /* We've imported the group from explicit parameters, set it so. */

+    group->decoded_from_explicit_params = 1;

     ok = 1;

  err:

     if (!ok) {

diff --git a/doc/man7/EVP_PKEY-EC.pod b/doc/man7/EVP_PKEY-EC.pod

index eed83237c3b2..ee66a074f889 100644

--- a/doc/man7/EVP_PKEY-EC.pod

+++ b/doc/man7/EVP_PKEY-EC.pod

@@ -70,8 +70,8 @@ I<order> multiplied by the I<cofactor> gives the number of points on the curve.

 =item  "decoded-from-explicit" (B<OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS>) <integer>

-Gets a flag indicating wether the key or parameters were decoded from explicit

-curve parameters. Set to 1 if so or 0 if a named curve was used.

+Sets or gets a flag indicating whether the key or parameters were decoded from

+explicit curve parameters. Set to 1 if so or 0 if a named curve was used.

 =item "use-cofactor-flag" (B<OSSL_PKEY_PARAM_USE_COFACTOR_ECDH>) <integer>

diff --git a/providers/implementations/keymgmt/ec_kmgmt.c b/providers/implementations/keymgmt/ec_kmgmt.c

index 9260d4bf3635..7aed057cac89 100644

--- a/providers/implementations/keymgmt/ec_kmgmt.c

+++ b/providers/implementations/keymgmt/ec_kmgmt.c

@@ -525,7 +525,8 @@ int ec_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,

     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_GENERATOR, NULL, 0),            \

     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_ORDER, NULL, 0),                          \

     OSSL_PARAM_BN(OSSL_PKEY_PARAM_EC_COFACTOR, NULL, 0),                       \

-    OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0)

+    OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_EC_SEED, NULL, 0),                 \

+    OSSL_PARAM_int(OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS, NULL)

 # define EC_IMEXPORTABLE_PUBLIC_KEY                                            \

     OSSL_PARAM_octet_string(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)

diff --git a/test/recipes/25-test_verify.t b/test/recipes/25-test_verify.t

index 700bbd849c95..ede14864d5ac 100644

--- a/test/recipes/25-test_verify.t

+++ b/test/recipes/25-test_verify.t

@@ -12,7 +12,7 @@ use warnings;

 use File::Spec::Functions qw/canonpath/;

 use File::Copy;

-use OpenSSL::Test qw/:DEFAULT srctop_file ok_nofips with/;

+use OpenSSL::Test qw/:DEFAULT srctop_file bldtop_dir ok_nofips with/;

 use OpenSSL::Test::Utils;

 setup("test_verify");

@@ -29,7 +29,7 @@ sub verify {

     run(app([@args]));

 }

-plan tests => 160;

+plan tests => 163;

 # Canonical success

 ok(verify("ee-cert", "sslserver", ["root-cert"], ["ca-cert"]),

@@ -309,6 +309,29 @@ SKIP: {

               ["ca-cert-ec-named"]),

         "accept named curve leaf with named curve intermediate");

 }

+# Same as above but with base provider used for decoding

+SKIP: {

+    my $no_fips = disabled('fips') || ($ENV{NO_FIPS} // 0);

+    skip "EC is not supported or FIPS is disabled", 3

+        if disabled("ec") || $no_fips;

+

+    my $provconf = srctop_file("test", "fips-and-base.cnf");

+    my $provpath = bldtop_dir("providers");

+    my @prov = ("-provider-path", $provpath);

+    $ENV{OPENSSL_CONF} = $provconf;

+

+    ok(!verify("ee-cert-ec-explicit", "", ["root-cert"],

+               ["ca-cert-ec-named"], @prov),

+        "reject explicit curve leaf with named curve intermediate w/fips");

+    ok(!verify("ee-cert-ec-named-explicit", "", ["root-cert"],

+               ["ca-cert-ec-explicit"], @prov),

+        "reject named curve leaf with explicit curve intermediate w/fips");

+    ok(verify("ee-cert-ec-named-named", "", ["root-cert"],

+              ["ca-cert-ec-named"], @prov),

+        "accept named curve leaf with named curve intermediate w/fips");

+

+    delete $ENV{OPENSSL_CONF};

+}

 # Depth tests, note the depth limit bounds the number of CA certificates

 # between the trust-anchor and the leaf, so, for example, with a root->ca->leaf