Stack-based buffer overflow in libsixel - CVE-2025-9300
Published: August 27, 2025
Vulnerability identifier: #VU114478
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-9300
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the sixel_debug_print_palette() function in encoder.c of the component img2sixel. A local user can trigger a stack-based buffer overflow and execute arbitrary code with elevated privileges.
Affected software
libsixel
Fedora
libsixel
Fedora
libsixel
How to mitigate CVE-2025-9300
Install updates from vendor's website.
libsixel - update to 1.10.5
libsixel - addressed in versions 1.10.5-3.fc41, 1.10.5-4.fc42, 1.10.5-4.fc43
libsixel - addressed in versions 1.10.5-3.fc41, 1.10.5-4.fc42, 1.10.5-4.fc43