diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5def56275..e7d2ff9167 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,16 @@ RELEASING:
 ### Fixed
 ### Security
 
+## [unreleased]
+
+### Added
+### Changed
+### Deprecated
+### Removed
+### Fixed
+- allow any number of csv columns ([#1436](https://github.com/GIScience/openrouteservice/issues/1436))
+### Security
+
 ## [8.1.1] - 2024-07-17
 ### Added
 - added danish tranlations ([#1809](https://github.com/GIScience/openrouteservice/pull/1809))
diff --git a/ors-engine/src/main/java/org/heigit/ors/routing/pathprocessors/ExtraInfoProcessor.java b/ors-engine/src/main/java/org/heigit/ors/routing/pathprocessors/ExtraInfoProcessor.java
index 99fcb6514a..9e0efe1cfb 100644
--- a/ors-engine/src/main/java/org/heigit/ors/routing/pathprocessors/ExtraInfoProcessor.java
+++ b/ors-engine/src/main/java/org/heigit/ors/routing/pathprocessors/ExtraInfoProcessor.java
@@ -127,6 +127,9 @@ public class ExtraInfoProcessor implements PathProcessor {
         encoderWithPriority = encoder.supports(PriorityWeighting.class);
         List<String> skippedExtras = new ArrayList<>();
 
+        //Sufficient size for every extra info except csv.
+        int buffer_size = 4;
+
         try {
             PMap params = opts;
             if (params == null) {
@@ -274,6 +277,9 @@ public class ExtraInfoProcessor implements PathProcessor {
                     csvInfo = new RouteExtraInfo("csv");
                     csvInfoBuilder = new AppendableRouteExtraInfoBuilder(csvInfo);
                     csvColumn = extCsvData.columnIndex(params.getString("weighting_#csv#column", ""));
+
+                    //Determine minimal size buffer size, as 4 might not be sufficient.
+                    buffer_size = Math.max(extCsvData.numEntries(), buffer_size);
                 } else {
                     skippedExtras.add("csv");
                 }
@@ -284,7 +290,7 @@ public class ExtraInfoProcessor implements PathProcessor {
         if (!skippedExtras.isEmpty()) {
             skippedExtraInfo = String.join(", ", skippedExtras);
         }
-        buffer = new byte[4];
+        buffer = new byte[buffer_size];
     }
 
     /**