Description
Stack overflow in the parse_tag function in libass/ass_parse.c in libass before 0.15.0 allows remote attackers to cause a denial of service or remote code execution via a crafted file.
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 | 1:0.15.0-1 | — |
| Debian 13 | libass | 1:0.15.0-1 | — |
| Debian 12 | libass | 1:0.15.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | libass | 1:0.17.4-2ubuntu0.1~esm1 | USN-8815-1 |
| Ubuntu Pro 24.04 LTS | libass | 1:0.17.1-2ubuntu0.1~esm1 | USN-8815-1 |
| Ubuntu Pro 20.04 LTS | libass | 1:0.14.0-2ubuntu0.1~esm1 | USN-8815-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libass | 1:0.14.0-1ubuntu0.1~esm1 | USN-8815-1 |
| Ubuntu Pro 16.04 LTS | libass | 0.13.1-1ubuntu0.1~esm2 | USN-4797-1 |
| Ubuntu Pro 14.04 LTS | libass | 0.10.1-3ubuntu1+esm2 | USN-8815-1, USN-4797-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | libass | 0.14.0-3.6.1 | SUSE-SU-2021:1664-1 |
| SLES 15 SP2 | libass | 0.14.0-3.6.1 | SUSE-SU-2021:1664-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | libass | 0.14.0-3.6.1 | openSUSE-SU-2021:1664-1 |
| openSUSE Leap 15.2 | libass | 0.14.0-lp152.4.6.1 | openSUSE-SU-2021:0773-1 |
Advisories 5
- USN-8815-1 libass vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-4797-1 libass vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- openSUSE-SU-2021:0773-1 Security update for libass SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1664-1 Security update for libass SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2021:1664-1 Security update for libass SUSE / openSUSE Security Updates · May 2, 2025