Description
The KaxInternalBlock::ReadData function in libMatroska before 1.4.4 allows context-dependent attackers to obtain sensitive information from process heap memory via crafted EBML lacing, which triggers an invalid memory access.
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 | libmatroska | 1.4.4-1 | — |
| Debian 13 | libmatroska | 1.4.4-1 | — |
| Debian 12 | libmatroska | 1.4.4-1 | — |
| Debian 8 | libmatroska | 1.4.1-2+deb8u1 | DSA-3526-1 |
| Debian 7 | libmatroska | 1.3.0-2+deb7u1 | DSA-3526-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | libmatroska | 0.8.1-1.1+deb6u1 | DLA-420-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | libmatroska | 1.4.1-2+deb8u1build0.14.04.1 | — |
Advisories 2
- DSA-3526-1 libmatroska - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-420-1 libmatroska - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://github.com/Matroska-Org/libmatroska/blob/release-1.4.4/ChangeLog
- https://github.com/Matroska-Org/libmatroska/commit/0a2d3e3644a7453b6513db2f9bc270f77943573f
- openSUSE-SU-2016:0125 vendor-advisory
- DSA-3526 vendor-advisory
- [matroska-users] 20151020 libEBML v1.3.3, libMatroska v1.4.4 released: important fixes mailing-list