Use After Free 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.
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Test your applications- Snyk IDSNYK-UNMANAGED-SAITOHALIBSIXEL-16110809
- published20 Apr 2026
- disclosed14 Apr 2026
- creditnicoppida
Introduced: 14 Apr 2026
CVE-2026-33021 (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 Use After Free in the sixel_encoder_encode_bytes process. An attacker can cause a crash or potentially execute arbitrary code by repeatedly triggering a resize operation that frees a caller-owned buffer, leaving a dangling pointer accessible for further manipulation.