diff --git a/Makefile b/Makefile
index 1039553a..7593cbdc 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ export RUSTFLAGS=-Dwarnings -Dclippy::all -Dclippy::pedantic
 
 CARGO_HACK_ARGS=--feature-powerset --exclude-features default --group-features base64,serde,arbitrary,hex
 
-XDRGEN_VERSION=92e5c651
+XDRGEN_VERSION=b405294c
 CARGO_DOC_ARGS?=--open
 
 all: build test
diff --git a/src/curr/generated.rs b/src/curr/generated.rs
index cbc42fbf..fc532a94 100644
--- a/src/curr/generated.rs
+++ b/src/curr/generated.rs
@@ -1326,7 +1326,7 @@ impl<T: ReadXdr, const MAX: u32> ReadXdr for VecM<T, MAX> {
                 return Err(Error::LengthExceedsMax);
             }
 
-            let mut vec = Vec::with_capacity(len as usize);
+            let mut vec = Vec::new();
             for _ in 0..len {
                 let t = T::read_xdr(r)?;
                 vec.push(t);
diff --git a/src/next/generated.rs b/src/next/generated.rs
index 6fde8785..998abefc 100644
--- a/src/next/generated.rs
+++ b/src/next/generated.rs
@@ -1326,7 +1326,7 @@ impl<T: ReadXdr, const MAX: u32> ReadXdr for VecM<T, MAX> {
                 return Err(Error::LengthExceedsMax);
             }
 
-            let mut vec = Vec::with_capacity(len as usize);
+            let mut vec = Vec::new();
             for _ in 0..len {
                 let t = T::read_xdr(r)?;
                 vec.push(t);
diff --git a/tests/vecm.rs b/tests/vecm.rs
new file mode 100644
index 00000000..ae899af0
--- /dev/null
+++ b/tests/vecm.rs
@@ -0,0 +1,44 @@
+#![cfg(all(
+    any(feature = "curr", feature = "next"),
+    not(all(feature = "curr", feature = "next"))
+))]
+#![cfg(feature = "std")]
+
+#[cfg(feature = "curr")]
+use stellar_xdr::curr as stellar_xdr;
+#[cfg(feature = "next")]
+use stellar_xdr::next as stellar_xdr;
+
+use stellar_xdr::{ReadXdr, ScVal};
+
+#[test]
+fn valid_len() {
+    let data = [
+        0x00, 0x00, 0x00, 0x11, // SCV_MAP
+        0x00, 0x00, 0x00, 0x01, // Some
+        0x00, 0x00, 0x00, 0x01, // map length
+        0x00, 0x00, 0x00, 0x0f, // SCV_SYMBOL
+        0x00, 0x00, 0x00, 0x03, // symbol length: 3
+        0x63, 0x6e, 0x74, 0x00, // symbol value : "cnt"
+        0x00, 0x00, 0x00, 0x03, // SCV_U32
+        0x00, 0x00, 0x00, 0x2a, // 42
+    ];
+    let result = ScVal::from_xdr(data);
+    assert!(result.is_ok());
+}
+
+#[test]
+fn invalid_len() {
+    let data = [
+        0x00, 0x00, 0x00, 0x11, // SCV_MAP
+        0x00, 0x00, 0x00, 0x01, // Some
+        0xff, 0xff, 0xff, 0xff, // map length (first byte invalid)
+        0x00, 0x00, 0x00, 0x0f, // SCV_SYMBOL
+        0x00, 0x00, 0x00, 0x03, // symbol length: 3
+        0x63, 0x6e, 0x74, 0x00, // symbol value : "cnt"
+        0x00, 0x00, 0x00, 0x03, // SCV_U32
+        0x00, 0x00, 0x00, 0x2a, // 42
+    ];
+    let result = ScVal::from_xdr(data);
+    assert!(result.is_err());
+}