diff --git a/napalm_proxmox/system_mixin.py b/napalm_proxmox/system_mixin.py
index 89425ee..6fdd7d0 100644
--- a/napalm_proxmox/system_mixin.py
+++ b/napalm_proxmox/system_mixin.py
@@ -244,7 +244,8 @@ class ProxmoxSystemMixin:
 
         # Installed packages via SSH dpkg-query
         raw = self._exec_ssh_command(
-            "dpkg-query -W -f='${Package}\\t${Version}\\t${db:Status-Status}\\t${Installed-Size}\\n'"
+            "dpkg-query -W -f="
+            "'${Package}\\t${Version}\\t${db:Status-Status}\\t${Installed-Size}\\t${source:Package}\\n'"
             " 2>/dev/null"
         )
         result: list[_JsonDict] = []
@@ -256,6 +257,9 @@ class ProxmoxSystemMixin:
             version = parts[1] if len(parts) > 1 else ""
             status = parts[2] if len(parts) > 2 else "installed"
             size_kb = parts[3] if len(parts) > 3 else "0"
+            # Debian source package (differs from the binary for split packages,
+            # e.g. openssh-server → openssh). Needed for accurate OSV matching.
+            source_package = parts[4] if len(parts) > 4 and parts[4] else name
             if not name or status != "installed":
                 continue
             size_bytes = int(size_kb) * 1024 if size_kb.isdigit() else 0
@@ -266,6 +270,7 @@ class ProxmoxSystemMixin:
                 "description": "",
                 "size": size_bytes,
                 "source": "pve",
+                "source_package": source_package,
                 "upgrade_version": upgradable.get(name, ""),
             })
         return result