Description
libass 0.15.x before 0.15.1 has a heap-based buffer overflow in decode_chars (called from decode_font and process_text) because the wrong integer data type is used for subtraction.
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 | libass | 1:0.15.0-2 | — |
| Debian 13 | libass | 1:0.15.0-2 | — |
| Debian 12 | libass | 1:0.15.0-2 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SLES 15 SP2 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SLES 15 SP1 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SLES 15 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SLES for SAP 15 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SLE HPC 15 SP1 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SLE HPC 15 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SUSE Manager Server 4.0 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SUSE Manager Retail Branch Server 4.0 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SUSE Manager Proxy 4.0 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
| SUSE Enterprise Storage 6 | libass | 0.14.0-3.9.1 | SUSE-SU-2021:2792-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | libass | 0.14.0-3.9.1 | openSUSE-SU-2021:2792-1 |
| openSUSE Leap 15.2 | libass | 0.14.0-lp152.4.9.1 | openSUSE-SU-2021:1174-1 |
Advisories 3
- openSUSE-SU-2021:2792-1 Security update for libass SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1174-1 Security update for libass SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2792-1 Security update for libass SUSE / openSUSE Security Updates · Feb 4, 2026