Description
Buffer overflow in the calc_coeff function in libass/ass_blur.c in libass before 0.13.4 allows remote attackers to cause a denial of service via unspecified vectors.
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 | 0.13.4-1 | — |
| Debian 13 | libass | 0.13.4-1 | — |
| Debian 12 | libass | 0.13.4-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | libass | 0.13.1-1ubuntu0.1~esm1 | USN-4797-1 |
| Ubuntu Pro 14.04 LTS | libass | 0.10.1-3ubuntu1+esm1 | USN-4797-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | libass | 0.10.2-3.1 | SUSE-SU-2016:3107-1 |
| SLES 12 SP1 | libass | 0.10.2-3.1 | SUSE-SU-2016:3107-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | libass | 0.10.2-3.1 | SUSE-SU-2016:3107-1 |
| SLES for SAP 12 SP1 | libass | 0.10.2-3.1 | SUSE-SU-2016:3107-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libass | 0.13.4-r0 | — |
| Alpine v3.23 | libass | 0.13.4-r0 | — |
| Alpine v3.22 | libass | 0.13.4-r0 | — |
| Alpine v3.21 | libass | 0.13.4-r0 | — |
| Alpine v3.20 | libass | 0.13.4-r0 | — |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libass | 0.13.4-r0 | — |
| Alpine v3.18 | libass | 0.13.4-r0 | — |
| Alpine v3.17 | libass | 0.13.4-r0 | — |
| Alpine v3.16 | libass | 0.13.4-r0 | — |
| Alpine v3.15 | libass | 0.13.4-r0 | — |
| Alpine v3.14 | libass | 0.13.4-r0 | — |
| Alpine v3.13 | libass | 0.13.4-r0 | — |
| Alpine v3.12 | libass | 0.13.4-r0 | — |
| Alpine v3.11 | libass | 0.13.4-r0 | — |
| Alpine v3.10 | libass | 0.13.4-r0 | — |
| Alpine v3.9 | libass | 0.13.4-r0 | — |
| Alpine v3.8 | libass | 0.13.4-r0 | — |
| Alpine v3.7 | libass | 0.13.4-r0 | — |
| Alpine v3.6 | libass | 0.13.4-r0 | — |
| Alpine v3.5 | libass | 0.13.4-r0 | — |
| Alpine v3.4 | libass | 0.13.4-r0 | — |
| Alpine v3.3 | libass | 0.13.4-r0 | — |
Advisories 2
- USN-4797-1 libass vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- SUSE-SU-2016:3107-1 Security update for libass SUSE / openSUSE Security Updates · Feb 4, 2026
References
- GLSA-201702-25 vendor-advisory
- 93358 vdb-entry
- https://github.com/libass/libass/releases/tag/0.13.4
- FEDORA-2016-282507c3e9 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1381960
- FEDORA-2016-d2a05a0644 vendor-advisory
- [oss-security] 20161004 Re: Handful of libass issues mailing-list
- FEDORA-2016-95407a836f vendor-advisory
- https://github.com/libass/libass/pull/240/commits/08e754612019ed84d1db0d1fc4f5798248decd75