diff --git a/src/api-v2.authz.test.ts b/src/api-v2.authz.test.ts
index b3ed580b..99714a77 100644
--- a/src/api-v2.authz.test.ts
+++ b/src/api-v2.authz.test.ts
@@ -1385,6 +1385,24 @@ describe('API V2 authz tests', () => {
         ingress: { mode: 'AllowAll' },
       },
     })
+    const createIngressAllowOnlyNetpol = (fromLabelValue: string, toLabelValue = 'frontend') =>
+      createTeamResource('AplTeamNetworkControl', {
+        ruleType: {
+          type: 'ingress',
+          ingress: {
+            mode: 'AllowOnly',
+            toLabelName: 'app',
+            toLabelValue,
+            allow: [
+              {
+                fromNamespace: 'team1',
+                fromLabelName: 'app',
+                fromLabelValue,
+              },
+            ],
+          },
+        },
+      })
 
     describe('Platform Admin', () => {
       test('platform admin can get all network policies', async () => {
@@ -1401,6 +1419,48 @@ describe('API V2 authz tests', () => {
           .expect(200)
       })
 
+      test('rejects multiline network policy label values', async () => {
+        const netpol = createIngressAllowOnlyNetpol('foo\nbar')
+
+        const response = await agent
+          .post('/v2/teams/team1/netpols')
+          .send(netpol)
+          .set('Authorization', `Bearer ${teamMemberToken}`)
+
+        expect(response.status).toBe(400)
+      })
+
+      it.each(['foo\nbar', 'foo\r\nbar', '{{ malicious }}', 'foo: bar', 'foo bar', '---'])(
+        'rejects invalid label value %p',
+        async (fromLabelValue) => {
+          const response = await agent
+            .post('/v2/teams/team1/netpols')
+            .send(createIngressAllowOnlyNetpol(fromLabelValue))
+            .set('Authorization', `Bearer ${teamMemberToken}`)
+
+          expect(response.status).toBe(400)
+        },
+      )
+
+      it.each(['app', 'my-app', 'my_app', 'my.app', 'APP123', ''])(
+        'accepts Kubernetes label value %p',
+        async (fromLabelValue) => {
+          await agent
+            .post('/v2/teams/team1/netpols')
+            .send(createIngressAllowOnlyNetpol(fromLabelValue))
+            .set('Authorization', `Bearer ${teamMemberToken}`)
+            .expect(200)
+        },
+      )
+
+      test('rejects invalid to-label value on ingress selector', async () => {
+        await agent
+          .post('/v2/teams/team1/netpols')
+          .send(createIngressAllowOnlyNetpol('frontend', 'foo\nbar'))
+          .set('Authorization', `Bearer ${teamMemberToken}`)
+          .expect(400)
+      })
+
       test('team member can get team network policies', async () => {
         await agent.get('/v2/teams/team1/netpols').set('Authorization', `Bearer ${teamMemberToken}`).expect(200)
       })
diff --git a/src/openapi/definitions.yaml b/src/openapi/definitions.yaml
index 763ddee6..375d8ff2 100644
--- a/src/openapi/definitions.yaml
+++ b/src/openapi/definitions.yaml
@@ -843,6 +843,14 @@ kms:
 labels:
   $ref: '#/annotations'
   description: A set of labels.
+kubernetesLabelName:
+  type: string
+  maxLength: 63
+  pattern: '^(?![\s\S]*[\r\n])[A-Za-z0-9](?:[-._A-Za-z0-9]{0,61}[A-Za-z0-9])?$'
+kubernetesLabelValue:
+  type: string
+  maxLength: 63
+  pattern: '^(?:$|(?![\s\S]*[\r\n])[A-Za-z0-9](?:[-._A-Za-z0-9]{0,61}[A-Za-z0-9])?)$'
 logLevel:
   title: Log Level
   type: string
diff --git a/src/openapi/netpol.yaml b/src/openapi/netpol.yaml
index e1012e15..accc8c27 100644
--- a/src/openapi/netpol.yaml
+++ b/src/openapi/netpol.yaml
@@ -52,12 +52,12 @@ ruleType:
       type: object
       properties:
         toLabelName:
-          type: string
+          $ref: 'definitions.yaml#/kubernetesLabelName'
           title: Selector label name
           description: 'The name of the Pod selector label.'
           example: app
         toLabelValue:
-          type: string
+          $ref: 'definitions.yaml#/kubernetesLabelValue'
           title: Selector label value
           description: 'The value of the Pod selector label.'
           example: my-app
@@ -79,12 +79,12 @@ ruleType:
                 title: Namespace name
                 description: 'The name of the namespace.'
               fromLabelName:
-                type: string
+                $ref: 'definitions.yaml#/kubernetesLabelName'
                 title: Selector label name
                 description: 'The name of the Pod selector label.'
                 example: app
               fromLabelValue:
-                type: string
+                $ref: 'definitions.yaml#/kubernetesLabelValue'
                 title: Selector label value
                 description: 'The value of the Pod selector label.'
                 example: my-app
diff --git a/src/patterns.test.ts b/src/patterns.test.ts
index e52af9fd..98206311 100644
--- a/src/patterns.test.ts
+++ b/src/patterns.test.ts
@@ -104,6 +104,10 @@ const redosCases: Record<string, string[]> = {
 
   k8sName: [`${'a-'.repeat(50_000)}!`],
 
+  kubernetesLabelValue: [`${'a-'.repeat(50_000)}!`, `${'a.'.repeat(50_000)}!`],
+
+  kubernetesLabelName: [`${'a-'.repeat(50_000)}!`, `${'a.'.repeat(50_000)}!`],
+
   idName: [`${'a-'.repeat(50_000)}!`],
 
   settingsName: [`${'aB'.repeat(50_000)}!`, `${'a-'.repeat(50_000)}!`],
@@ -147,6 +151,8 @@ describe('OpenAPI definition regex patterns', () => {
         'email',
         'hostPort',
         'k8sName',
+        'kubernetesLabelValue',
+        'kubernetesLabelName',
         'idName',
         'quantityCpu',
         'quantityMem',
@@ -242,6 +248,59 @@ describe('OpenAPI definition regex patterns', () => {
     })
   })
 
+  describe('kubernetesLabelValue', () => {
+    it('accepts valid Kubernetes label values', () => {
+      expectValid('kubernetesLabelValue', ['', 'app', 'my-app', 'my_app', 'my.app', 'APP123', 'a'.repeat(63)])
+    })
+
+    it('rejects invalid Kubernetes label values', () => {
+      expectInvalid('kubernetesLabelValue', [
+        '-app',
+        'app-',
+        '.app',
+        'app.',
+        '_app',
+        'app_',
+        'app value',
+        'foo\nbar',
+        'foo\r\nbar',
+        'app\n',
+        'app\r\n',
+        '{{ malicious }}',
+        'foo: bar',
+        '---',
+        'a'.repeat(64),
+      ])
+    })
+  })
+
+  describe('kubernetesLabelName', () => {
+    it('accepts valid Kubernetes label names', () => {
+      expectValid('kubernetesLabelName', ['app', 'my-app', 'my_app', 'my.app', 'APP123', 'a'.repeat(63)])
+    })
+
+    it('rejects invalid Kubernetes label names', () => {
+      expectInvalid('kubernetesLabelName', [
+        '',
+        '-app',
+        'app-',
+        '.app',
+        'app.',
+        '_app',
+        'app_',
+        'app name',
+        'foo\nbar',
+        'foo\r\nbar',
+        'app\n',
+        'app\r\n',
+        '{{ malicious }}',
+        'foo: bar',
+        '---',
+        'a'.repeat(64),
+      ])
+    })
+  })
+
   describe('idName', () => {
     it('accepts valid ID names', () => {
       expectValid('idName', ['a', 'secret', 'secret-name', 'secret1'])