Heap-based Buffer Overflow Affecting saitoha/libsixel package, versions [,1.8.7-r1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Heap-based Buffer Overflow vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-UNMANAGED-SAITOHALIBSIXEL-16110810
- published20 Apr 2026
- disclosed14 Apr 2026
- creditnicoppida
Introduced: 14 Apr 2026
CVE-2026-33020 (opens in a new tab)How to fix?
Upgrade saitoha/libsixel to version 1.8.7-r1 or higher.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow in the write_png_to_file process due to improper integer arithmetic when handling palettised PNG images. An attacker can cause heap corruption and potentially execute arbitrary code by supplying a specially crafted large image file.