What is CVE-2026-44636?

CVE-2026-44636 is a high-severity vulnerability in Saitoha Libsixel, classified under Heap-based Buffer Overflow. CVSS score: 7.4/10. Published 2026-05-14.

How severe is CVE-2026-44636?

High severity. CVSS v3 base score is 7.4 out of 10.

Buffer overflow in Saitoha Libsixel

CVE-2026-44636

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, signed integer overflow in sixel_encode_highcolor's allocation size calculation can lead to a heap buffer overflow. The public sixel_encode e…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (3.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Saitoha Libsixel — versions >= 1.4.4, < 1.8.7-r2

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow
CWE-190 — Integer Overflow or Wraparound

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44636?: CVE-2026-44636 is a high-severity vulnerability in Saitoha Libsixel, classified under Heap-based Buffer Overflow. CVSS score: 7.4/10. Published 2026-05-14.
How severe is CVE-2026-44636?: High severity. CVSS v3 base score is 7.4 out of 10.