diff --git a/docs/release-control/v6/internal/subsystems/patrol-intelligence.md b/docs/release-control/v6/internal/subsystems/patrol-intelligence.md
index 7fa074f84..53872e1c9 100644
--- a/docs/release-control/v6/internal/subsystems/patrol-intelligence.md
+++ b/docs/release-control/v6/internal/subsystems/patrol-intelligence.md
@@ -781,6 +781,9 @@ approval consumers must treat the approval queue as `soonest expiry first`,
 then higher risk, then older request time, rather than inheriting raw API
 order. Approval-linked findings must follow that same ordering so multi-approval
 `Review` actions jump to the most urgent finding instead of an arbitrary one.
+Malformed or missing approval timestamps must sort after valid timestamps and
+must not produce non-deterministic comparator results in the shared urgency
+utility.
 Patrol fix approvals also inherit the unified action-governance preflight
 contract: queued fixes must keep their plan-level dry-run availability, safety
 checks, verification steps, approval policy, and action id in the shared
diff --git a/frontend-modern/src/utils/__tests__/approvalRiskPresentation.test.ts b/frontend-modern/src/utils/__tests__/approvalRiskPresentation.test.ts
index 686f5f14f..825dd1cd6 100644
--- a/frontend-modern/src/utils/__tests__/approvalRiskPresentation.test.ts
+++ b/frontend-modern/src/utils/__tests__/approvalRiskPresentation.test.ts
@@ -1,5 +1,8 @@
 import { describe, expect, it } from 'vitest';
-import { getApprovalRiskPresentation } from '@/utils/approvalRiskPresentation';
+import {
+  getApprovalRiskPresentation,
+  sortPendingApprovalsByUrgency,
+} from '@/utils/approvalRiskPresentation';
 
 describe('approvalRiskPresentation', () => {
   it('maps high and critical risk to danger styling', () => {
@@ -30,4 +33,78 @@ describe('approvalRiskPresentation', () => {
   it('handles missing values as unknown', () => {
     expect(getApprovalRiskPresentation().label).toBe('unknown');
   });
+
+  it('sorts approvals by soonest expiry before risk', () => {
+    const approvals = sortPendingApprovalsByUrgency([
+      approval({ id: 'critical-later', expiresAt: '2026-05-07T10:10:00Z', riskLevel: 'critical' }),
+      approval({ id: 'low-sooner', expiresAt: '2026-05-07T10:05:00Z', riskLevel: 'low' }),
+    ]);
+
+    expect(approvals.map(({ id }) => id)).toEqual(['low-sooner', 'critical-later']);
+  });
+
+  it('sorts same-expiry approvals by descending risk', () => {
+    const approvals = sortPendingApprovalsByUrgency([
+      approval({ id: 'low', riskLevel: 'low' }),
+      approval({ id: 'high', riskLevel: 'high' }),
+      approval({ id: 'critical', riskLevel: 'critical' }),
+      approval({ id: 'medium', riskLevel: 'medium' }),
+    ]);
+
+    expect(approvals.map(({ id }) => id)).toEqual(['critical', 'high', 'medium', 'low']);
+  });
+
+  it('sorts same-expiry and same-risk approvals by older request time', () => {
+    const approvals = sortPendingApprovalsByUrgency([
+      approval({ id: 'newer', requestedAt: '2026-05-07T10:02:00Z' }),
+      approval({ id: 'older', requestedAt: '2026-05-07T10:01:00Z' }),
+    ]);
+
+    expect(approvals.map(({ id }) => id)).toEqual(['older', 'newer']);
+  });
+
+  it('sorts malformed or missing expiry values after valid expiries', () => {
+    const approvals = sortPendingApprovalsByUrgency([
+      approval({ id: 'missing-expiry', expiresAt: undefined }),
+      approval({ id: 'malformed-expiry', expiresAt: 'not-a-date' }),
+      approval({ id: 'valid-expiry', expiresAt: '2026-05-07T10:05:00Z' }),
+    ]);
+
+    expect(approvals.map(({ id }) => id)).toEqual([
+      'valid-expiry',
+      'missing-expiry',
+      'malformed-expiry',
+    ]);
+  });
+
+  it('sorts malformed or missing request times after valid request times', () => {
+    const approvals = sortPendingApprovalsByUrgency([
+      approval({ id: 'missing-request', requestedAt: undefined }),
+      approval({ id: 'malformed-request', requestedAt: 'not-a-date' }),
+      approval({ id: 'valid-request', requestedAt: '2026-05-07T10:01:00Z' }),
+    ]);
+
+    expect(approvals.map(({ id }) => id)).toEqual([
+      'valid-request',
+      'missing-request',
+      'malformed-request',
+    ]);
+  });
 });
+
+function approval(overrides: {
+  id: string;
+  expiresAt?: string | undefined;
+  requestedAt?: string | undefined;
+  riskLevel?: string;
+}) {
+  const hasOverride = (key: 'expiresAt' | 'requestedAt') =>
+    Object.prototype.hasOwnProperty.call(overrides, key);
+
+  return {
+    id: overrides.id,
+    expiresAt: hasOverride('expiresAt') ? overrides.expiresAt : '2026-05-07T10:05:00Z',
+    requestedAt: hasOverride('requestedAt') ? overrides.requestedAt : '2026-05-07T10:00:00Z',
+    riskLevel: overrides.riskLevel ?? 'medium',
+  };
+}
diff --git a/frontend-modern/src/utils/approvalRiskPresentation.ts b/frontend-modern/src/utils/approvalRiskPresentation.ts
index 9e561585f..6d6a64ac2 100644
--- a/frontend-modern/src/utils/approvalRiskPresentation.ts
+++ b/frontend-modern/src/utils/approvalRiskPresentation.ts
@@ -5,10 +5,10 @@ export interface ApprovalRiskPresentation {
 
 const APPROVAL_RISK_SORT_ORDER: Record<string, number> = {
   critical: 0,
-  high: 0,
-  medium: 1,
-  low: 2,
-  unknown: 3,
+  high: 1,
+  medium: 2,
+  low: 3,
+  unknown: 4,
 };
 
 function normalizeApprovalRiskLevel(level?: string): string {
@@ -50,16 +50,29 @@ export function getApprovalRiskSortOrder(level?: string): number {
   return APPROVAL_RISK_SORT_ORDER[normalized] ?? APPROVAL_RISK_SORT_ORDER.unknown;
 }
 
+function getApprovalTimestampSortValue(value?: string | null): number {
+  const parsed = Date.parse(value ?? '');
+  return Number.isFinite(parsed) ? parsed : Number.POSITIVE_INFINITY;
+}
+
+function compareApprovalTimestamps(a?: string | null, b?: string | null): number {
+  const aValue = getApprovalTimestampSortValue(a);
+  const bValue = getApprovalTimestampSortValue(b);
+
+  if (aValue === bValue) return 0;
+  return aValue < bValue ? -1 : 1;
+}
+
 export function sortPendingApprovalsByUrgency<
-  T extends { expiresAt: string; requestedAt: string; riskLevel?: string },
+  T extends { expiresAt?: string | null; requestedAt?: string | null; riskLevel?: string },
 >(approvals: T[]): T[] {
   return [...approvals].sort((a, b) => {
-    const expiryDiff = new Date(a.expiresAt).getTime() - new Date(b.expiresAt).getTime();
+    const expiryDiff = compareApprovalTimestamps(a.expiresAt, b.expiresAt);
     if (expiryDiff !== 0) return expiryDiff;
 
     const riskDiff = getApprovalRiskSortOrder(a.riskLevel) - getApprovalRiskSortOrder(b.riskLevel);
     if (riskDiff !== 0) return riskDiff;
 
-    return new Date(a.requestedAt).getTime() - new Date(b.requestedAt).getTime();
+    return compareApprovalTimestamps(a.requestedAt, b.requestedAt);
   });
 }