An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file.
https://github.com/saitoha/libsixel/releases/tag/v1.8.4
https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037
https://github.com/saitoha/libsixel/blob/master/ChangeLog
https://github.com/saitoha/libsixel/issues/73
https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad
Source: Mitre, NVD
Published: 2021-09-14
Updated: 2021-09-24
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.00412