diff --git a/commons/http-framework/core/src/main/java/org/forgerock/http/io/ByteArrayBranchingStream.java b/commons/http-framework/core/src/main/java/org/forgerock/http/io/ByteArrayBranchingStream.java
index f5b09043b..8c15b1545 100644
--- a/commons/http-framework/core/src/main/java/org/forgerock/http/io/ByteArrayBranchingStream.java
+++ b/commons/http-framework/core/src/main/java/org/forgerock/http/io/ByteArrayBranchingStream.java
@@ -13,6 +13,7 @@
  *
  * Copyright 2010–2011 ApexIdentity Inc.
  * Portions Copyright 2011-2016 ForgeRock AS.
+ * Portions Copyrighted 2026 3A Systems, LLC
  */
 
 package org.forgerock.http.io;
@@ -102,7 +103,7 @@ public boolean markSupported() {
     }
 
     @Override
-    public void mark(int readlimit) {
+    public synchronized void mark(int readlimit) {
         mark = position;
     }
 
diff --git a/persistit/core/src/main/java/com/persistit/PersistitMap.java b/persistit/core/src/main/java/com/persistit/PersistitMap.java
index 6639524f4..4acdf1369 100644
--- a/persistit/core/src/main/java/com/persistit/PersistitMap.java
+++ b/persistit/core/src/main/java/com/persistit/PersistitMap.java
@@ -741,7 +741,7 @@ public static class PersistitMapException extends RuntimeException {
         }
 
         @Override
-        public Throwable getCause() {
+        public synchronized Throwable getCause() {
             return _exception;
         }
     }
diff --git a/persistit/core/src/main/java/com/persistit/Value.java b/persistit/core/src/main/java/com/persistit/Value.java
index 7e7cdb172..8f95cf61e 100644
--- a/persistit/core/src/main/java/com/persistit/Value.java
+++ b/persistit/core/src/main/java/com/persistit/Value.java
@@ -5056,12 +5056,12 @@ protected final void readStreamHeader() throws IOException {
     }
 
     @Override
-    public void mark(final int readLimit) {
+    public synchronized void mark(final int readLimit) {
       _mark = _value._next;
     }
 
     @Override
-    public void reset() throws IOException {
+    public synchronized void reset() throws IOException {
       if (_mark < 0) {
         throw new IOException("No mark");
       } else {