Description
libcaca is a colour ASCII art library. In 0.99.beta20 and earlier, an integer overflow vulnerability in libcaca's canvas import functionality allows an attacker to cause a controlled heap out-of-bounds write (heap overflow) by supplying a crafted file in the "caca" format. Depending on the build configuration and memory allocator, this may lead to memory corruption or remote code execution. This is the same vulnerability as CVE-2021-3410 but the fix at that time was not fully correct. Commit fb77acff9ba6bb01d53940da34fb10f20b156a23 fixes this vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| cacalabs | libcaca | <= 0.99.beta20 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libcaca | 0.99.beta20-7 | — |
| Debian 13 | libcaca | 0.99.beta20-5+deb13u1 | — |
| Debian 12 | libcaca | 0.99.beta20-3+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libcaca | 0.99.beta20-6ubuntu2.1 | USN-8318-1 |
| Ubuntu 25.10 | libcaca | 0.99.beta20-5ubuntu0.25.10.2 | USN-8318-1 |
| Ubuntu 24.04 LTS | libcaca | 0.99.beta20-4ubuntu0.2 | USN-8318-1 |
| Ubuntu 22.04 LTS | libcaca | 0.99.beta19-2.2ubuntu4.2 | USN-8318-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libcaca | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libcaca | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libcaca | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libcaca | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libcaca | 0.99.beta20-150600.3.3.1 | SUSE-SU-2026:2423-1 |
| SLES 15 SP6 | libcaca | 0.99.beta20-150600.3.3.1 | SUSE-SU-2026:2423-1 |
| SLES 15 SP5 | libcaca | 0.99.beta19.git20171003-150200.11.12.1 | SUSE-SU-2026:2424-1 |
| SLES 15 SP4 | libcaca | 0.99.beta19.git20171003-150200.11.12.1 | SUSE-SU-2026:2424-1 |
| SLES 12 SP5 | libcaca | 0.99.beta18-14.15.1 | SUSE-SU-2026:2394-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libcaca | 0.99.beta20-160000.3.1 | SUSE-SU-2026:22175-1 |
| SLES for SAP 15 SP6 | libcaca | 0.99.beta20-150600.3.3.1 | SUSE-SU-2026:2423-1 |
| SLES for SAP 15 SP5 | libcaca | 0.99.beta19.git20171003-150200.11.12.1 | SUSE-SU-2026:2424-1 |
| SLES for SAP 15 SP4 | libcaca | 0.99.beta19.git20171003-150200.11.12.1 | SUSE-SU-2026:2424-1 |
| SLES 16.0 | libcaca | 0.99.beta20-160000.3.1 | SUSE-SU-2026:22175-1 |
| SLE HPC 15 SP5 | libcaca | 0.99.beta19.git20171003-150200.11.12.1 | SUSE-SU-2026:2424-1 |
| SLE HPC 15 SP4 | libcaca | 0.99.beta19.git20171003-150200.11.12.1 | SUSE-SU-2026:2424-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libcaca | 0.99.beta20+git.1776622070.7c8e333-1.1 | openSUSE-SU-2026:10834-1 |
| openSUSE Leap 16.0 | libcaca | 0.99.beta20-160000.3.1 | openSUSE-SU-2026:21101-1 |
Advisories 7
- openSUSE-SU-2026:21101-1 Security update for libcaca SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22175-1 Security update for libcaca SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:2423-1 Security update for libcaca SUSE / openSUSE Security Updates · Jun 17, 2026
- SUSE-SU-2026:2424-1 Security update for libcaca SUSE / openSUSE Security Updates · Jun 17, 2026
- SUSE-SU-2026:2394-1 Security update for libcaca SUSE / openSUSE Security Updates · Jun 16, 2026
- USN-8318-1 libcaca vulnerability Ubuntu Security Notices (USN) · May 27, 2026
- openSUSE-SU-2026:10834-1 caca-utils-0.99.beta20+git.1776622070.7c8e333-1.1 on GA media SUSE / openSUSE Security Updates · May 22, 2026