Description
A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libebml | before 1.4.2 | — |
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 | libebml | 1.4.2-1 | — |
| Debian 13 | libebml | 1.4.2-1 | — |
| Debian 12 | libebml | 1.4.2-1 | — |
| Debian 9 | libebml | 1.3.4-1+deb9u2 | DLA-2629-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | libebml | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libebml | 1.4.2-r0 | — |
| Alpine v3.23 | libebml | 1.4.2-r0 | — |
| Alpine v3.22 | libebml | 1.4.2-r0 | — |
| Alpine v3.21 | libebml | 1.4.2-r0 | — |
| Alpine v3.20 | libebml | 1.4.2-r0 | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libebml | 1.4.2-r0 | — |
| Alpine v3.18 | libebml | 1.4.2-r0 | — |
| Alpine v3.17 | libebml | 1.4.2-r0 | — |
| Alpine v3.16 | libebml | 1.4.2-r0 | — |
| Alpine v3.15 | libebml | 1.4.2-r0 | — |
| Alpine v3.14 | libebml | 1.4.2-r0 | — |
| Alpine v3.13 | libebml | 1.4.2-r0 | — |
Advisories 1
- DLA-2629-1 libebml - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://github.com/Matroska-Org/libebml/issues/74
- FEDORA-2021-9a0fff8455 vendor-advisory
- FEDORA-2021-aa78f97893 vendor-advisory
- FEDORA-2021-e283997bb9 vendor-advisory
- [debian-lts-announce] 20210418 [SECURITY] [DLA 2629-1] libebml security update mailing-list
- GLSA-202208-21 vendor-advisory