diff --git a/pkgs/development/python-modules/pypdf2/default.nix b/pkgs/development/python-modules/pypdf2/default.nix
index 1fbf80ad74c6..9cf70b3b9bb2 100644
--- a/pkgs/development/python-modules/pypdf2/default.nix
+++ b/pkgs/development/python-modules/pypdf2/default.nix
@@ -29,5 +29,13 @@ buildPythonPackage rec {
     homepage = "https://pypdf2.readthedocs.io/";
     changelog = "https://github.com/py-pdf/PyPDF2/raw/${version}/CHANGELOG.md";
     license = lib.licenses.bsd3;
+    knownVulnerabilities = [
+      "CVE-2026-27024"
+      "CVE-2026-27025"
+      "CVE-2026-27628"
+      "CVE-2026-27888"
+      "CVE-2026-28351"
+      "CVE-2026-33699"
+    ];
   };
 }
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"
+    ];
   };
 })