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High severityNVD Advisory· Published Mar 18, 2026· Updated Mar 18, 2026

jsPDF has a PDF Object Injection via FreeText color

CVE-2026-31898

Description

jsPDF is a library to generate PDFs in JavaScript. Prior to version 4.2.1, user control of arguments of the createAnnotation method allows users to inject arbitrary PDF objects, such as JavaScript actions. If given the possibility to pass unsanitized input to the following method, a user can inject arbitrary PDF objects, such as JavaScript actions, which might trigger when the PDF is opened or interacted with the createAnnotation: color parameter. The vulnerability has been fixed in jsPDF@4.2.1. As a workaround, sanitize user input before passing it to the vulnerable API members.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
jspdfnpm
< 4.2.14.2.1

Affected products

1

Patches

1
4155c4819d5e

Merge commit from fork

https://github.com/parallax/jsPDF22shMar 17, 2026via ghsa
commit
2 files changed · +26 −4
  • src/modules/annotations.js+4 −4 modified
    @@ -191,6 +191,9 @@ import { jsPDF } from "../jspdf.js";
               getVerticalCoordinateString(anno.bounds.y + anno.bounds.h) +
               "] ";
             var color = anno.color || "#000000";
+            var defaultStyle =
+              "font: Helvetica,sans-serif 12.0pt; text-align:left; color:#" +
+              color;
             line =
               "<</Type /Annot /Subtype /" +
               "FreeText" +
@@ -199,10 +202,7 @@ import { jsPDF } from "../jspdf.js";
               "/Contents (" +
               escape(encryptor(anno.contents)) +
               ")";
-            line +=
-              " /DS(font: Helvetica,sans-serif 12.0pt; text-align:left; color:#" +
-              color +
-              ")";
+            line += " /DS(" + escape(encryptor(defaultStyle)) + ")";
             line += " /Border [0 0 0]";
             line += " >>";
             this.internal.write(line);
  • test/specs/annotations.spec.js+22 −0 modified
    @@ -55,6 +55,28 @@ describe("Module: Annotations", () => {
     });
     comparePdf(doc.output(), "freetext.pdf", "annotations");
   });
+  it("should escape free text annotation style strings", () => {
+    const doc = jsPDF({ floatPrecision: 2 });
+    doc.createAnnotation({
+      type: "freetext",
+      bounds: {
+        x: 0,
+        y: 10,
+        w: 200,
+        h: 20
+      },
+      contents: "This is a freetext annotation",
+      color: '000000) /AA <</E <</S /JavaScript /JS (alert("x"))>>>> ('
+    });
+
+    const output = doc.output();
+    const dsMatch = output.match(/\/DS\((.*)\) \/Border \[0 0 0\]/);
+
+    expect(dsMatch).not.toBeNull();
+    expect(dsMatch[1]).toContain(
+      'color:#000000\\) /AA <</E <</S /JavaScript /JS \\(alert\\("x"\\)\\)>>>> \\('
+    );
+  });
   it("should draw a link on the text with link after add page", () => {
     const doc = new jsPDF({
       unit: "px",

Vulnerability mechanics

Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

6

News mentions

0

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