diff --git a/.github/actions/osv-scanner/action.yml b/.github/actions/osv-scanner/action.yml
index 4bfb5993cb..de5116fdcf 100644
--- a/.github/actions/osv-scanner/action.yml
+++ b/.github/actions/osv-scanner/action.yml
@@ -1,5 +1,5 @@
 name: 'OSV-Scanner'
-description: 'Install osv-scanner and scan a lockfile, failing on HIGH/CRITICAL/UNKNOWN severity findings. Posts/updates a PR comment with findings on pull_request events (requires pull-requests: write).'
+description: 'Install osv-scanner and scan a lockfile, failing on CRITICAL severity findings. Posts/updates a PR comment with findings on pull_request events (requires pull-requests: write).'
 author: 'Prowler'
 
 inputs:
@@ -7,9 +7,9 @@ inputs:
     description: 'Path to the lockfile to scan, relative to the repository root (e.g. uv.lock, api/uv.lock, ui/pnpm-lock.yaml).'
     required: true
   severity-levels:
-    description: 'Comma-separated severity levels that fail the scan. Default: HIGH,CRITICAL,UNKNOWN.'
+    description: 'Comma-separated severity levels that fail the scan. Default: CRITICAL.'
     required: false
-    default: 'HIGH,CRITICAL,UNKNOWN'
+    default: 'CRITICAL'
   version:
     description: 'osv-scanner release tag to install. When overriding, you MUST also override binary-sha256.'
     required: false
diff --git a/.github/scripts/osv-scan.sh b/.github/scripts/osv-scan.sh
index d9c2e1a901..16afc6668c 100755
--- a/.github/scripts/osv-scan.sh
+++ b/.github/scripts/osv-scan.sh
@@ -6,8 +6,7 @@
 #   - .github/workflows/api-security.yml, sdk-security.yml, ui-security.yml
 #
 # Severity levels (comma-separated) are read from OSV_SEVERITY_LEVELS.
-# Default: HIGH,CRITICAL,UNKNOWN — preserves prior .safety-policy.yml policy
-#   (ignore-cvss-severity-below: 7 + ignore-cvss-unknown-severity: False).
+# Default: CRITICAL — only CVSS >= 9.0 findings fail the scan.
 # osv-scanner has no native CVSS threshold (google/osv-scanner#1400, closed
 # not-planned). Severity is derived from $group.max_severity (numeric CVSS
 # score string) which osv-scanner emits per group.
@@ -33,7 +32,7 @@ set -euo pipefail
 
 ROOT="$(git rev-parse --show-toplevel)"
 CONFIG="${ROOT}/osv-scanner.toml"
-SEVERITY_LEVELS="${OSV_SEVERITY_LEVELS:-HIGH,CRITICAL,UNKNOWN}"
+SEVERITY_LEVELS="${OSV_SEVERITY_LEVELS:-CRITICAL}"
 
 for bin in osv-scanner jq; do
   if ! command -v "${bin}" >/dev/null 2>&1; then
diff --git a/.github/workflows/api-container-checks.yml b/.github/workflows/api-container-checks.yml
index 44482e2428..e1bd756d86 100644
--- a/.github/workflows/api-container-checks.yml
+++ b/.github/workflows/api-container-checks.yml
@@ -134,5 +134,5 @@ jobs:
         with:
           image-name: ${{ env.IMAGE_NAME }}
           image-tag: ${{ github.sha }}
-          fail-on-critical: 'false'
+          fail-on-critical: 'true'
           severity: 'CRITICAL'
diff --git a/.github/workflows/mcp-container-checks.yml b/.github/workflows/mcp-container-checks.yml
index 7493e1b763..5f7a9f1447 100644
--- a/.github/workflows/mcp-container-checks.yml
+++ b/.github/workflows/mcp-container-checks.yml
@@ -127,5 +127,5 @@ jobs:
         with:
           image-name: ${{ env.IMAGE_NAME }}
           image-tag: ${{ github.sha }}
-          fail-on-critical: 'false'
+          fail-on-critical: 'true'
           severity: 'CRITICAL'
diff --git a/.github/workflows/sdk-container-checks.yml b/.github/workflows/sdk-container-checks.yml
index 42709ac6f7..fcb30578d8 100644
--- a/.github/workflows/sdk-container-checks.yml
+++ b/.github/workflows/sdk-container-checks.yml
@@ -153,5 +153,5 @@ jobs:
         with:
           image-name: ${{ env.IMAGE_NAME }}
           image-tag: ${{ github.sha }}
-          fail-on-critical: 'false'
+          fail-on-critical: 'true'
           severity: 'CRITICAL'
diff --git a/.github/workflows/ui-container-checks.yml b/.github/workflows/ui-container-checks.yml
index 0eae703fce..10415f4d48 100644
--- a/.github/workflows/ui-container-checks.yml
+++ b/.github/workflows/ui-container-checks.yml
@@ -132,5 +132,5 @@ jobs:
         with:
           image-name: ${{ env.IMAGE_NAME }}
           image-tag: ${{ github.sha }}
-          fail-on-critical: 'false'
+          fail-on-critical: 'true'
           severity: 'CRITICAL'