# CVE-2026-44638

## Summary

- **CVE ID:** CVE-2026-44638
- **Severity:** LOW
- **CVSS Score:** 2.5 (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L)
- **CWE:** CWE-476, CWE-690
- **Published:** May 14, 2026
- **Last Modified:** May 15, 2026

## Description

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From  to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_raw and sixel_decode causes a NULL pointer dereference whenever the allocation fails. The check tests the address of the output parameter (always non-NULL) instead of the value the malloc returned. On allocation failure, the function continues and writes through a NULL pointer, crashing the process. This is a denial of service against any caller of these public APIs that hits a low-memory condition. This vulnerability is fixed in 1.8.7-r2.

## Affected Products

- saitoha — libsixel (>= 1.0.0, < 1.8.7-r2)

## References

- [CNA](https://github.com/saitoha/libsixel/security/advisories/GHSA-wpx3-h5g8-qr3w)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 3.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._