Heap-based Buffer Overflow Affecting saitoha/libsixel package, versions [1.4.4,1.8.7-r2)
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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- published15 May 2026
- disclosed14 May 2026
- creditUnknown
Introduced: 14 May 2026
NewCVE-2026-44636 (opens in a new tab)How to fix?
Upgrade saitoha/libsixel to version 1.8.7-r2 or higher.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow due to improper allocation size calculation in the sixel_encode_highcolor process. An attacker can cause a heap buffer overflow by providing crafted input values for width and height that, when multiplied, exceed the maximum integer value, resulting in a wrapped allocation and subsequent out-of-bounds write.