# CVE-2026-94545: Satori HTML-to-SVG converter improper escaping

Source: https://junglewise.ai/threats/cve-2026-94545-satori-is-a-library-to-convert-html-and-css-to-svg-starting-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-94545 · Severity: medium · CVSS 4 · Published 2026-09-30

Satori is a library that converts HTML and CSS into SVG images, commonly used in server-side image generation. A flaw in versions 0.0.27 through 0.33.4 fails to properly escape user-controlled input before embedding it in the generated SVG output, potentially allowing crafted input to be interpreted as SVG markup with consequences depending on how the SVG is used downstream.

Vendors: [Vercel](https://junglewise.ai/threats/vendors/vercel).

## Quick answers

**Is CVE-2026-94545 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-94545 being exploited in the wild.

**How severe is CVE-2026-94545?** Medium severity, with a CVSS score of 4, published 30 September 2026.

**Which products and versions are affected?** Vercel Satori 0.0.27 to 0.33.4; Satori >= 0.0.27, < 0.33.5, SEMVER:introduced=0.0.27,fixed=0.33.5.

**Is there a fix for CVE-2026-94545?** Yes. Satori: upgrade to 0.33.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-94545 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-94545?** Check whether you run Vercel Satori or Satori at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Satori: upgrade to 0.33.5 or later

## Technical details

Satori does not properly escape certain values before including them in generated SVG output, allowing crafted input to be interpreted as SVG markup. The vulnerability affects versions 0.0.27 through 0.33.4 and requires attacker-controlled content to be processed by the library. The impact varies based on the context of SVG consumption; version 0.33.5 and later contain the fix.

## Affected products

- Vercel Satori 0.0.27 to 0.33.4

## Identifiers

- CVE-2026-94545
- GHSA-wx4j-mvgx-mqwp

## Timeline

- 2026-09-30: disclosed

## References

- [https://github.com/vercel/next.js/commit/868fad38690d72088868f299fa2bef339b26838e](https://github.com/vercel/next.js/commit/868fad38690d72088868f299fa2bef339b26838e)
- [https://github.com/vercel/next.js/releases/tag/v16.3.6](https://github.com/vercel/next.js/releases/tag/v16.3.6)