diff --git a/.changeset/nine-cougars-kneel.md b/.changeset/nine-cougars-kneel.md
new file mode 100644
index 0000000000..acafb614cd
--- /dev/null
+++ b/.changeset/nine-cougars-kneel.md
@@ -0,0 +1,7 @@
+---
+"@cloudoperators/juno-app-doop": patch
+"@cloudoperators/juno-app-heureka": patch
+"@cloudoperators/juno-app-supernova": patch
+---
+
+fix(heureka): correct numeric searchTerm URL param to string in search box
diff --git a/apps/doop/src/lib/helpers.ts b/apps/doop/src/lib/helpers.ts
index 6d3a1443f2..57673926b5 100644
--- a/apps/doop/src/lib/helpers.ts
+++ b/apps/doop/src/lib/helpers.ts
@@ -3,6 +3,15 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import { z } from "zod"
+
+/** Zod schema for optional URL search params that may be parsed as numbers by TanStack Router. */
+export const optionalStringSchema = z.preprocess(
+  (val) =>
+    val === undefined || val === null ? undefined : typeof val === "string" ? val : String(val as number | boolean),
+  z.string().optional()
+)
+
 export const parseError = (error: any) => {
   if (!error || (typeof error === "object" && Object.keys(error).length === 0))
     return "An error occurred. There is no further information"
diff --git a/apps/doop/src/routes/violations.tsx b/apps/doop/src/routes/violations.tsx
index a77359f553..664e19dd8e 100644
--- a/apps/doop/src/routes/violations.tsx
+++ b/apps/doop/src/routes/violations.tsx
@@ -17,13 +17,13 @@ import {
 } from "../components/StoreProvider"
 import { parseInitialFilters } from "../lib/store/createFiltersSlice"
 import { isObjectWithKeys } from "../lib/helpers"
-import { filterSearchParamsByPrefix } from "../lib/helpers"
+import { filterSearchParamsByPrefix, optionalStringSchema } from "../lib/helpers"
 
 const filterValueSchema = z.union([z.string(), z.array(z.string()), z.undefined()])
 
 const searchSchema = z
   .object({
-    searchTerm: z.string().optional(),
+    searchTerm: optionalStringSchema,
     violationGroup: z.string().optional(),
   })
   .catchall(filterValueSchema)
diff --git a/apps/heureka/src/routes/services/index.tsx b/apps/heureka/src/routes/services/index.tsx
index 6209eefd39..1705cd4bcf 100644
--- a/apps/heureka/src/routes/services/index.tsx
+++ b/apps/heureka/src/routes/services/index.tsx
@@ -13,14 +13,14 @@ import { SELECTED_FILTER_PREFIX } from "../../constants"
 import { fetchServices } from "../../api/fetchServices"
 import { fetchServicesFilters } from "../../api/fetchServicesFilters"
 import { extractFilterSettingsFromSearchParams } from "../../components/Services/utils"
-import { filterSearchParamsByPrefix } from "../../utils"
+import { filterSearchParamsByPrefix, optionalStringSchema } from "../../utils"
 
 const filterValueSchema = z.union([z.string(), z.array(z.string()), z.undefined()])
 
 const servicesSearchSchema = z
   .object({
     service: z.string().optional(),
-    searchTerm: z.string().optional(),
+    searchTerm: optionalStringSchema,
   })
   .catchall(filterValueSchema)
 
diff --git a/apps/heureka/src/routes/vulnerabilities/index.tsx b/apps/heureka/src/routes/vulnerabilities/index.tsx
index e39330b1bb..c4f0a09fd3 100644
--- a/apps/heureka/src/routes/vulnerabilities/index.tsx
+++ b/apps/heureka/src/routes/vulnerabilities/index.tsx
@@ -10,14 +10,14 @@ import { SELECTED_FILTER_PREFIX } from "../../constants"
 import { fetchVulnerabilities } from "../../api/fetchVulnerabilities"
 import { fetchVulnerabilityFilters } from "../../api/fetchVulnerabilityFilters"
 import { extractFilterSettingsFromSearchParams } from "../../components/Vulnerabilities/utils"
-import { filterSearchParamsByPrefix } from "../../utils"
+import { filterSearchParamsByPrefix, optionalStringSchema } from "../../utils"
 
 const filterValueSchema = z.union([z.string(), z.array(z.string()), z.undefined()])
 
 const vulnerabilitiesSearchSchema = z
   .object({
     vulnerability: z.string().optional(),
-    searchTerm: z.preprocess((val) => (typeof val === "number" ? val.toString() : val), z.string().optional()),
+    searchTerm: optionalStringSchema,
   })
   .catchall(filterValueSchema)
 
diff --git a/apps/heureka/src/utils.ts b/apps/heureka/src/utils.ts
index 94e9e35bbd..34766f6c52 100644
--- a/apps/heureka/src/utils.ts
+++ b/apps/heureka/src/utils.ts
@@ -5,6 +5,14 @@
 
 import { useState, useRef, useEffect, Dispatch, SetStateAction } from "react"
 import { KnownIcons } from "@cloudoperators/juno-ui-components"
+import { z } from "zod"
+
+/** Zod schema for optional URL search params that may be parsed as numbers by TanStack Router. */
+export const optionalStringSchema = z.preprocess(
+  (val) =>
+    val === undefined || val === null ? undefined : typeof val === "string" ? val : String(val as number | boolean),
+  z.string().optional()
+)
 
 export const capitalizeFirstLetter = (str: string): string => {
   return str.charAt(0).toUpperCase() + str.slice(1)
diff --git a/apps/supernova/src/lib/utils.ts b/apps/supernova/src/lib/utils.ts
index cb9c9e850b..7e119c216e 100644
--- a/apps/supernova/src/lib/utils.ts
+++ b/apps/supernova/src/lib/utils.ts
@@ -3,6 +3,15 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+import { z } from "zod"
+
+/** Zod schema for optional URL search params that may be parsed as numbers by TanStack Router. */
+export const optionalStringSchema = z.preprocess(
+  (val) =>
+    val === undefined || val === null ? undefined : typeof val === "string" ? val : String(val as number | boolean),
+  z.string().optional()
+)
+
 import { AlertItem, SeverityCounts } from "./createAlertsSlice"
 
 export const severityToSemanticName = (severity: any) => {
diff --git a/apps/supernova/src/routes/alerts.tsx b/apps/supernova/src/routes/alerts.tsx
index 4bf24e57cc..f37e04118d 100644
--- a/apps/supernova/src/routes/alerts.tsx
+++ b/apps/supernova/src/routes/alerts.tsx
@@ -13,14 +13,13 @@ import AlertsTab from "../components/alerts/AlertsTab"
 import { ACTIVE_FILTERS_PREFIX, PAUSED_FILTERS_PREFIX } from "../constants"
 import { convertUrlStateToAppState, getFiltersForUrl } from "../lib/urlStateUtils"
 import { useGlobalsActions, useFilterActions, useGlobalsInitialFiltersApplied } from "../components/StoreProvider"
-import { isObjectWithKeys } from "../lib/utils"
-import { filterSearchParamsByPrefix } from "../lib/utils"
+import { isObjectWithKeys, filterSearchParamsByPrefix, optionalStringSchema } from "../lib/utils"
 
 const filterValueSchema = z.union([z.string(), z.array(z.string()), z.undefined()])
 
 const searchSchema = z
   .object({
-    searchTerm: z.string().optional(),
+    searchTerm: optionalStringSchema,
     showDetailsFor: z.string().optional(),
     predefinedFilter: z.string().optional(),
   })