Status: UPDATED | Advisory ID: CVE-2026-33019
| CVE | CVE-2026-33019 |
| CVSS Score / Version | 7.1 (High) / CVSS v3.1 |
| Updated | 2026-07-25 |
| CVSS Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H |
| CVSS Prose | attack vector is local; attack complexity is low; privileges required is none; user interaction is required; scope is unchanged; confidentiality impact is high; integrity impact is none; availability impact is high. |
| Affected products | saitoha libsixel |
| Classified as | CWE-125 (Out-of-bounds Read) |
| Vendor | Product | Affected Versions | Patch Status |
|---|---|---|---|
| saitoha | libsixel |
| Subsystems | General OT |
| Sectors | Multiple |
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1. (NVD)
Monitor saitoha's web page for any future patch releases. See vendor advisory link below.