diff --git a/server/routers/newt/handleSocketMessages.ts b/server/routers/newt/handleSocketMessages.ts
index 383ab55418..eabdf12138 100644
--- a/server/routers/newt/handleSocketMessages.ts
+++ b/server/routers/newt/handleSocketMessages.ts
@@ -33,6 +33,46 @@ export const handleDockerStatusMessage: MessageHandler = async (context) => {
     return;
 };
 
+interface ChunkAccumulator {
+    batchId: string;
+    totalChunks: number;
+    receivedChunks: number;
+    containers: any[];
+}
+
+/**
+ * Cache key for in-progress chunked container data, scoped by newt and batch.
+ */
+function getChunkCacheKey(newtId: string): string {
+    return `${newtId}:dockerContainersChunks`;
+}
+
+/**
+ * Process a complete container list (either received all at once or after reassembly).
+ */
+async function processContainerList(
+    newtId: string,
+    siteId: number | null,
+    containers: any[]
+) {
+    logger.info(
+        `Docker containers for Newt ${newtId}: ${containers.length}`
+    );
+
+    if (containers.length > 0) {
+        await cache.set(`${newtId}:dockerContainers`, containers, 0);
+    } else {
+        logger.warn(`Newt ${newtId} does not have Docker containers`);
+    }
+
+    if (!siteId) {
+        logger.warn("Newt has no site!");
+        return;
+    }
+
+    await applyNewtDockerBlueprint(siteId, newtId, containers);
+}
+
 export const handleDockerContainersMessage: MessageHandler = async (
     context
 ) => {
@@ -47,22 +87,83 @@ export const handleDockerContainersMessage: MessageHandler = async (
     }
 
     logger.info(`Newt ID: ${newt.newtId}, Site ID: ${newt.siteId}`);
-    const { containers } = message.data;
+    const { containers, chunkIndex, totalChunks, batchId } = message.data;
+
+    // Non-chunked message (backward compatible with older newt versions)
+    if (totalChunks === undefined || totalChunks <= 1) {
+        await processContainerList(
+            newt.newtId,
+            newt.siteId,
+            containers || []
+        );
+        return;
+    }
+
+    // Validate chunk metadata
+    if (
+        typeof chunkIndex !== "number" ||
+        typeof totalChunks !== "number" ||
+        chunkIndex < 0 ||
+        chunkIndex >= totalChunks ||
+        totalChunks > 100
+    ) {
+        logger.warn(
+            `Invalid chunk metadata from Newt ${newt.newtId}: chunkIndex=${chunkIndex}, totalChunks=${totalChunks}`
+        );
+        return;
+    }
+
+    if (!batchId || typeof batchId !== "string") {
+        logger.warn(
+            `Missing batchId in chunked message from Newt ${newt.newtId}`
+        );
+        return;
+    }
 
     logger.info(
-        `Docker containers for Newt ${newt.newtId}: ${containers ? containers.length : 0}`
+        `Received chunk ${chunkIndex + 1}/${totalChunks} for Newt ${newt.newtId} batch=${batchId} (${containers?.length || 0} containers)`
     );
 
-    if (containers && containers.length > 0) {
-        await cache.set(`${newt.newtId}:dockerContainers`, containers, 0);
+    const chunkKey = getChunkCacheKey(newt.newtId);
+    const existing = await cache.get<ChunkAccumulator>(chunkKey);
+
+    let accumulator: ChunkAccumulator;
+
+    if (!existing || existing.batchId !== batchId) {
+        // New batch or different batch — start fresh
+        // This handles concurrent sends: the newer batch supersedes the old one
+        if (existing && existing.batchId !== batchId) {
+            logger.info(
+                `New batch ${batchId} supersedes in-progress batch ${existing.batchId} for Newt ${newt.newtId}`
+            );
+        }
+        accumulator = {
+            batchId,
+            totalChunks,
+            receivedChunks: 0,
+            containers: []
+        };
     } else {
-        logger.warn(`Newt ${newt.newtId} does not have Docker containers`);
+        accumulator = existing;
     }
 
-    if (!newt.siteId) {
-        logger.warn("Newt has no site!");
-        return;
+    if (containers && Array.isArray(containers)) {
+        accumulator.containers.push(...containers);
     }
+    accumulator.receivedChunks++;
 
-    await applyNewtDockerBlueprint(newt.siteId, newt.newtId, containers);
+    if (accumulator.receivedChunks >= accumulator.totalChunks) {
+        logger.info(
+            `All ${totalChunks} chunks received for Newt ${newt.newtId} batch=${batchId}, total containers: ${accumulator.containers.length}`
+        );
+        await cache.del(chunkKey);
+        await processContainerList(
+            newt.newtId,
+            newt.siteId,
+            accumulator.containers
+        );
+    } else {
+        // Store partial data with a TTL to prevent stale chunks from accumulating
+        await cache.set(chunkKey, accumulator, 120);
+    }
 };