Heap-based buffer overflow in libcaca - CVE-2026-42046

Vulnerability identifier: #VU127881

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-42046

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow caused by integer overflow in the canvas import functions when parsing a crafted file in the "caca" format. A remote attacker can supply a specially crafted file to execute arbitrary code.

User interaction is required to open or import the crafted file, and the impact may depend on the build configuration and memory allocator.

libcaca
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
Basesystem Module
openSUSE Leap
Ubuntu
Fedora
libcaca0-plugins
libcaca0
libcaca0-debuginfo
libcaca-devel
libcaca-debugsource
libcaca0-plugins-debuginfo
libcaca (Ubuntu package)
caca-utils
libcaca-ruby-debuginfo
libcaca-ruby
python3-caca
libcaca0-plugins-32bit-debuginfo
libcaca0-32bit
libcaca0-plugins-32bit
libcaca0-32bit-debuginfo
libcaca0-plugins-64bit-debuginfo
libcaca0-plugins-64bit
libcaca0-64bit
libcaca0-64bit-debuginfo
caca-utils-debuginfo
libcaca

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

libcaca0-plugins - addressed in versions 0.99 beta18-14.15.1, 0.99 beta19.git20171003-150200.11.12.1, 0.99 beta20-150600.3.3.1
libcaca0 - addressed in versions 0.99 beta18-14.15.1, 0.99 beta19.git20171003-150200.11.12.1, 0.99 beta20-150600.3.3.1
libcaca0-debuginfo - addressed in versions 0.99 beta18-14.15.1, 0.99 beta19.git20171003-150200.11.12.1, 0.99 beta20-150600.3.3.1
libcaca-devel - addressed in versions 0.99 beta18-14.15.1, 0.99 beta19.git20171003-150200.11.12.1, 0.99 beta20-150600.3.3.1
libcaca-debugsource - addressed in versions 0.99 beta18-14.15.1, 0.99 beta19.git20171003-150200.11.12.1, 0.99 beta20-150600.3.3.1
libcaca0-plugins-debuginfo - addressed in versions 0.99 beta18-14.15.1, 0.99 beta19.git20171003-150200.11.12.1, 0.99 beta20-150600.3.3.1
libcaca (Ubuntu package) - addressed in versions 0.99 beta19-2.2ubuntu4.2, 0.99 beta20-4ubuntu0.2, 0.99 beta20-5ubuntu0.25.10.2, 0.99 beta20-6ubuntu2.1
caca-utils - update to 0.99 beta20-150600.3.3.1
libcaca-ruby-debuginfo - update to 0.99 beta20-150600.3.3.1
libcaca-ruby - update to 0.99 beta20-150600.3.3.1
python3-caca - update to 0.99 beta20-150600.3.3.1
libcaca0-plugins-32bit-debuginfo - update to 0.99 beta20-150600.3.3.1
libcaca0-32bit - update to 0.99 beta20-150600.3.3.1
libcaca0-plugins-32bit - update to 0.99 beta20-150600.3.3.1
libcaca0-32bit-debuginfo - update to 0.99 beta20-150600.3.3.1
libcaca0-plugins-64bit-debuginfo - update to 0.99 beta20-150600.3.3.1
libcaca0-plugins-64bit - update to 0.99 beta20-150600.3.3.1
libcaca0-64bit - update to 0.99 beta20-150600.3.3.1
libcaca0-64bit-debuginfo - update to 0.99 beta20-150600.3.3.1
caca-utils-debuginfo - update to 0.99 beta20-150600.3.3.1
libcaca - update to 0.99-0.83.beta20.fc45

• https://github.com/cacalabs/libcaca/security/advisories/GHSA-4vvg-vrqv-m56w
• https://github.com/advisories/GHSA-4vvg-vrqv-m56w

• Remote code execution in libcaca
• Fedora 45 update for libcaca
• Ubuntu update for libcaca
• SUSE update for libcaca
• SUSE update for libcaca
• SUSE update for libcaca