Use After Free in Saitoha Libsixel
CVE-2026-33023
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. In versions 1.8.7 and prior, when built with the --with-gdk-pixbuf2 option, a use-after-free vulnerability exists in load_with_gdkpixbuf() in loader.c. The clea…
Vulnerability class: Use-After-Free
EPSS: 0.003 (21.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Saitoha Libsixel — versions < 1.8.7-r1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-33023?
- CVE-2026-33023 is a high-severity vulnerability in Saitoha Libsixel, classified under Use After Free. CVSS score: 7.8/10. Published 2026-04-14.
- How severe is CVE-2026-33023?
- High severity. CVSS v3 base score is 7.8 out of 10.