DEBIAN-CVE-2026-33019
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-33019
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33019.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-33019
- Upstream
- Published
- 2026-04-14T22:16:30Z
- Modified
- 2026-09-14T17:03:08Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Debian:12 / libsixel
Package
- Name
- libsixel
- Purl
- pkg:deb/debian/libsixel?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / libsixel
Package
- Name
- libsixel
- Purl
- pkg:deb/debian/libsixel?arch=source&distro=trixie
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:14 / libsixel
Package
- Name
- libsixel
- Purl
- pkg:deb/debian/libsixel?arch=source&distro=forky