diff --git a/client/src/features/admin/SessionEnvironmentFormContent.tsx b/client/src/features/admin/SessionEnvironmentFormContent.tsx
index dcd230f424..b37adf83f2 100644
--- a/client/src/features/admin/SessionEnvironmentFormContent.tsx
+++ b/client/src/features/admin/SessionEnvironmentFormContent.tsx
@@ -19,6 +19,8 @@
 import cx from "classnames";
 import { Control, Controller, FieldErrors } from "react-hook-form";
 import { Input, Label } from "reactstrap";
+
+import { CONTAINER_IMAGE_PATTERN } from "../sessionsV2/session.constants";
 import SessionEnvironmentAdvancedFields from "./SessionEnvironmentAdvancedFields";
 
 export interface SessionEnvironmentForm {
@@ -105,9 +107,18 @@ export default function SessionEnvironmentFormContent({
               {...field}
             />
           )}
-          rules={{ required: true }}
+          rules={{
+            required: "Please provide a container image.",
+            pattern: {
+              value: CONTAINER_IMAGE_PATTERN,
+              message: "Please provide a valid container image.",
+            },
+          }}
         />
-        <div className="invalid-feedback">Please provide a container image</div>
+        <div className="invalid-feedback">
+          {errors.container_image?.message ??
+            "Please provide a valid container image."}
+        </div>
       </div>
       <SessionEnvironmentAdvancedFields control={control} errors={errors} />
     </>
diff --git a/client/src/features/sessionsV2/components/SessionForm/CustomEnvironmentFields.tsx b/client/src/features/sessionsV2/components/SessionForm/CustomEnvironmentFields.tsx
index a143d22672..6ea4c389aa 100644
--- a/client/src/features/sessionsV2/components/SessionForm/CustomEnvironmentFields.tsx
+++ b/client/src/features/sessionsV2/components/SessionForm/CustomEnvironmentFields.tsx
@@ -17,13 +17,15 @@
  */
 
 import cx from "classnames";
-import { useState, useCallback } from "react";
+import { useCallback, useState } from "react";
 import { Controller } from "react-hook-form";
-import { Label, Input, Collapse } from "reactstrap";
+import { Collapse, Input, Label } from "reactstrap";
+
 import ChevronFlippedIcon from "../../../../components/icons/ChevronFlippedIcon";
-import { EnvironmentFieldsProps } from "./EnvironmentField";
-import { AdvancedSettingsFields } from "./AdvancedSettingsFields";
+import { CONTAINER_IMAGE_PATTERN } from "../../session.constants";
 import { SessionLauncherForm } from "../../sessionsV2.types";
+import { AdvancedSettingsFields } from "./AdvancedSettingsFields";
+import { EnvironmentFieldsProps } from "./EnvironmentField";
 
 export function CustomEnvironmentFields({
   watch,
@@ -65,9 +67,21 @@ export function CustomEnvironmentFields({
               {...field}
             />
           )}
-          rules={{ required: watchEnvironmentKind === "CUSTOM" }}
+          rules={{
+            required: {
+              value: watchEnvironmentKind === "CUSTOM",
+              message: "Please provide a container image.",
+            },
+            pattern: {
+              value: CONTAINER_IMAGE_PATTERN,
+              message: "Please provide a valid container image.",
+            },
+          }}
         />
-        <div className="invalid-feedback">Please provide a container image</div>
+        <div className="invalid-feedback">
+          {errors.container_image?.message ??
+            "Please provide a valid container image."}
+        </div>
       </div>
       <div>
         <span
diff --git a/client/src/features/sessionsV2/components/SessionForm/EditLauncherFormContent.tsx b/client/src/features/sessionsV2/components/SessionForm/EditLauncherFormContent.tsx
index 7fb7565b27..e7a1529689 100644
--- a/client/src/features/sessionsV2/components/SessionForm/EditLauncherFormContent.tsx
+++ b/client/src/features/sessionsV2/components/SessionForm/EditLauncherFormContent.tsx
@@ -27,9 +27,11 @@ import {
   UseFormWatch,
 } from "react-hook-form";
 import { Collapse, Input, Label, ListGroup } from "reactstrap";
+
 import { RtkErrorAlert } from "../../../../components/errors/RtkErrorAlert";
 import ChevronFlippedIcon from "../../../../components/icons/ChevronFlippedIcon";
 import { Loader } from "../../../../components/Loader";
+import { CONTAINER_IMAGE_PATTERN } from "../../session.constants";
 import { prioritizeSelectedEnvironment } from "../../session.utils";
 import { useGetSessionEnvironmentsQuery } from "../../sessionsV2.api";
 import { SessionLauncherForm } from "../../sessionsV2.types";
@@ -137,7 +139,6 @@ export default function EditLauncherFormContent({
       <Controller
         control={control}
         name="container_image"
-        rules={{ required: environmentKind === "CUSTOM" }}
         render={({ field }) => (
           <Input
             id="addSessionLauncherContainerImage"
@@ -146,8 +147,21 @@ export default function EditLauncherFormContent({
             className={cx(errors.container_image && "is-invalid")}
           />
         )}
+        rules={{
+          required: {
+            value: environmentKind === "CUSTOM",
+            message: "Please provide a container image.",
+          },
+          pattern: {
+            value: CONTAINER_IMAGE_PATTERN,
+            message: "Please provide a valid container image.",
+          },
+        }}
       />
-      <div className="invalid-feedback">Please provide a container image</div>
+      <div className="invalid-feedback">
+        {errors.container_image?.message ??
+          "Please provide a valid container image."}
+      </div>
       <div>
         <span
           className={cx("fw-bold", "cursor-pointer")}
diff --git a/client/src/features/sessionsV2/session.constants.ts b/client/src/features/sessionsV2/session.constants.ts
index 1bd8747259..2ea641a8c8 100644
--- a/client/src/features/sessionsV2/session.constants.ts
+++ b/client/src/features/sessionsV2/session.constants.ts
@@ -84,3 +84,6 @@ Default: \`1000\`.`,
   command: `The command that will be run i.e. will overwrite the image Dockerfile \`ENTRYPOINT\`.`,
   args: `The arguments that will follow the command, i.e. will overwrite the image Dockerfile \`CMD\`.`,
 };
+
+export const CONTAINER_IMAGE_PATTERN =
+  /^[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*(\/[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*)*(:[a-zA-Z0-9_][a-zA-Z0-9._-]{0,127}|@sha256:[a-fA-F0-9]{64}){0,1}$/;