diff --git a/changelog/17944.txt b/changelog/17944.txt
new file mode 100644
index 000000000..2ce17ca36
--- /dev/null
+++ b/changelog/17944.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+core: Fix potential deadlock if barrier ciphertext is less than 4 bytes.
+```
diff --git a/vault/barrier_aes_gcm.go b/vault/barrier_aes_gcm.go
index a531bacd4..b6f6d96df 100644
--- a/vault/barrier_aes_gcm.go
+++ b/vault/barrier_aes_gcm.go
@@ -1069,11 +1069,13 @@ func (b *AESGCMBarrier) Decrypt(_ context.Context, key string, ciphertext []byte
 	}
 
 	if len(ciphertext) == 0 {
+		b.l.RUnlock()
 		return nil, fmt.Errorf("empty ciphertext")
 	}
 
 	// Verify the term
 	if len(ciphertext) < 4 {
+		b.l.RUnlock()
 		return nil, fmt.Errorf("invalid ciphertext term")
 	}
 	term := binary.BigEndian.Uint32(ciphertext[:4])