What is CVE-2026-44637?

CVE-2026-44637 is a high-severity vulnerability in Saitoha Libsixel, classified under Integer Overflow or Wraparound. CVSS score: 7.1/10. Published 2026-05-14.

How severe is CVE-2026-44637?

High severity. CVSS v3 base score is 7.1 out of 10.

Buffer overflow in Saitoha Libsixel

CVE-2026-44637

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser's image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl…

Vulnerability class: Integer Overflow

EPSS: 0.000 (2.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.

Affected products

Saitoha Libsixel — versions >= 0.11.0, < 1.8.7-r2

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound
CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-44637?: CVE-2026-44637 is a high-severity vulnerability in Saitoha Libsixel, classified under Integer Overflow or Wraparound. CVSS score: 7.1/10. Published 2026-05-14.
How severe is CVE-2026-44637?: High severity. CVSS v3 base score is 7.1 out of 10.