---
title: "1.13.1 release notes"
canonical_url: "https://www.nutrient.io/guides/web/release-notes/1-13-1/"
md_url: "https://www.nutrient.io/guides/web/release-notes/1-13-1.md"
last_updated: "2026-04-07T00:00:00.000Z"
description: "Nutrient Web SDK 1.13.1 release notes — security patch for high-severity libpng CVEs."
---

Nutrient Web SDK 1.13.1 is a security patch that updates the vendored libpng dependency from 1.6.55 to 1.6.56, addressing two high-severity CVEs. See the [changelog](https://www.nutrient.io/guides/web/changelog.md#1.13.1) for full details.

### Security

This release resolves the following vulnerabilities in libpng:

- **CVE-2026-33416** (CVSS 7.5) — A denial-of-service vulnerability in libpng 1.6.55.

- **CVE-2026-33636** (CVSS 7.6) — A potentially exploitable vulnerability in libpng 1.6.55.

Both are resolved by updating to libpng 1.6.56. No API changes or migration steps are required.

Document Engine 1.5.6 or later can run this release. However, `instance.exportPDF()` requires Document Engine 1.12.0 or later because earlier versions require legacy query-parameter authentication for the `/pdf` endpoint. See the [Web SDK and Document Engine compatibility requirements](https://www.nutrient.io/guides/document-engine/viewer/client-integration/web.md#version-compatibility).
---

## Related pages

- [1 0](/guides/web/release-notes/1-0.md)
- [1 1](/guides/web/release-notes/1-1.md)
- [1 10](/guides/web/release-notes/1-10.md)
- [1 11](/guides/web/release-notes/1-11.md)
- [1 12](/guides/web/release-notes/1-12.md)
- [1 13](/guides/web/release-notes/1-13.md)
- [1 14](/guides/web/release-notes/1-14.md)
- [1 15](/guides/web/release-notes/1-15.md)
- [1 16](/guides/web/release-notes/1-16.md)
- [1 17](/guides/web/release-notes/1-17.md)
- [1 18](/guides/web/release-notes/1-18.md)
- [1 19](/guides/web/release-notes/1-19.md)
- [1 2](/guides/web/release-notes/1-2.md)
- [1 20](/guides/web/release-notes/1-20.md)
- [1 21](/guides/web/release-notes/1-21.md)
- [1 22](/guides/web/release-notes/1-22.md)
- [1 3](/guides/web/release-notes/1-3.md)
- [1 4](/guides/web/release-notes/1-4.md)
- [1 5](/guides/web/release-notes/1-5.md)
- [1 6](/guides/web/release-notes/1-6.md)
- [1 7](/guides/web/release-notes/1-7.md)
- [1 8](/guides/web/release-notes/1-8.md)
- [1 9](/guides/web/release-notes/1-9.md)
- [2017 3](/guides/web/release-notes/2017-3.md)
- [2017 6](/guides/web/release-notes/2017-6.md)
- [Update your PSPDFKit for Web to version 2017.7](/guides/web/release-notes/2017-7.md)
- [Upgrade annotations in PSPDFKit Web 2017.8](/guides/web/release-notes/2017-8.md)
- [Explore new features in PSPDFKit for Web 2017.9](/guides/web/release-notes/2017-9.md)
- [New features in the 2018.1 migration guide](/guides/web/release-notes/2018-1.md)
- [PSPDFKit for Web 2018.2 migration insights](/guides/web/release-notes/2018-2.md)
- [Discover the new features in PSPDFKit for Web 2018.3](/guides/web/release-notes/2018-3.md)
- [Explore PSPDFKit for Web 2018.4 features](/guides/web/release-notes/2018-4.md)
- [Explore new features in PSPDFKit 2018.5](/guides/web/release-notes/2018-5.md)
- [Explore PSPDFKit for Web 2018.6 enhancements](/guides/web/release-notes/2018-6.md)
- [Explore the new features in PSPDFKit 2018.7](/guides/web/release-notes/2018-7.md)
- [Key updates in PSPDFKit for Web 2019.1](/guides/web/release-notes/2019-1.md)
- [2019 2](/guides/web/release-notes/2019-2.md)
- [PSPDFKit for Web 2019.3 migration highlights](/guides/web/release-notes/2019-3.md)
- [Essential updates in PSPDFKit for Web 2019.4](/guides/web/release-notes/2019-4.md)
- [PSPDFKit for Web 2019.5 migration insights](/guides/web/release-notes/2019-5.md)
- [Key changes in PSPDFKit for Web 2020.1](/guides/web/release-notes/2020-1.md)
- [Seamless migration to PSPDFKit for Web 2020.2](/guides/web/release-notes/2020-2.md)
- [Upgrade to PSPDFKit Web 2020.3 seamlessly](/guides/web/release-notes/2020-3.md)
- [PSPDFKit Web and Server 2020.4 migration update](/guides/web/release-notes/2020-4.md)
- [Unified CRUD API enhancements for easy migration](/guides/web/release-notes/2020-5.md)
- [PSPDFKit Web 2020.6 migration insights](/guides/web/release-notes/2020-6.md)
- [Upgrade to PSPDFKit for Web 2021.1 with ease](/guides/web/release-notes/2021-1.md)
- [Seamlessly migrate to PSPDFKit for Web 2021.2](/guides/web/release-notes/2021-2.md)
- [2021 3](/guides/web/release-notes/2021-3.md)
- [PSPDFKit 2021.4 migration guide for seamless updates](/guides/web/release-notes/2021-4.md)
- [Migration guide for PSPDFKit 2021.5](/guides/web/release-notes/2021-5.md)
- [2021 6](/guides/web/release-notes/2021-6.md)
- [PSPDFKit 2022.1.1 migration changes](/guides/web/release-notes/2022-1.md)
- [Enhancements in PSPDFKit for Web 2022.2](/guides/web/release-notes/2022-2.md)
- [Explore the new features of PSPDFKit for Web 2022.3](/guides/web/release-notes/2022-3.md)
- [PSPDFKit for Web 2022.4 migration overview](/guides/web/release-notes/2022-4.md)
- [Key improvements in PSPDFKit for Web 2022.5](/guides/web/release-notes/2022-5.md)
- [Discover the key updates in PSPDFKit for Web 2023.1](/guides/web/release-notes/2023-1.md)
- [PSPDFKit 2023.2 migration and updates](/guides/web/release-notes/2023-2.md)
- [Key updates in PSPDFKit for Web 2023.3](/guides/web/release-notes/2023-3.md)
- [Explore key updates in PSPDFKit for Web 2023.4](/guides/web/release-notes/2023-4.md)
- [Key updates in PSPDFKit for Web 2023.5](/guides/web/release-notes/2023-5.md)
- [Essential Nutrient Web SDK 2024.1 migration tips](/guides/web/release-notes/2024-1.md)
- [2024 2](/guides/web/release-notes/2024-2.md)
- [2024 3](/guides/web/release-notes/2024-3.md)
- [2024 4](/guides/web/release-notes/2024-4.md)
- [2024 5](/guides/web/release-notes/2024-5.md)
- [2024 7](/guides/web/release-notes/2024-7.md)
- [2024 8](/guides/web/release-notes/2024-8.md)
- [Upgrading Nutrient Web SDK](/guides/web/release-notes/upgrading.md)