diff --git a/pkgs/development/python-modules/pypdf3/default.nix b/pkgs/development/python-modules/pypdf3/default.nix
index 2b44c409778e..9e4305c4b231 100644
--- a/pkgs/development/python-modules/pypdf3/default.nix
+++ b/pkgs/development/python-modules/pypdf3/default.nix
@@ -32,5 +32,13 @@ buildPythonPackage (finalAttrs: {
     homepage = "https://github.com/sfneal/PyPDF3";
     license = lib.licenses.bsd3;
     maintainers = with lib.maintainers; [ ambroisie ];
+    knownVulnerabilities = [
+      "CVE-2026-27024"
+      "CVE-2026-27025"
+      "CVE-2026-27628"
+      "CVE-2026-27888"
+      "CVE-2026-28351"
+      "CVE-2026-33699"
+    ];
   };
 })