Description
The matchCurrentInput function inside lou_translateString.c of Liblouis prior to 3.7 does not check the input string's length, allowing attackers to cause a denial of service (application crash via out-of-bounds read) by crafting an input file with certain translation dictionaries.
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 | liblouis | 3.7.0-1 | — |
| Debian 13 | liblouis | 3.7.0-1 | — |
| Debian 12 | liblouis | 3.7.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | liblouis | 3.5.0-1ubuntu0.3 | USN-3782-1 |
| Ubuntu 16.04 LTS | liblouis | 2.6.4-2ubuntu0.4 | USN-3782-1 |
| Ubuntu 14.04 LTS | liblouis | 2.5.3-2ubuntu1.5 | USN-3782-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | liblouis | 3.3.0-4.5.1 | SUSE-SU-2019:0795-1 |
| SLES 12 SP5 | liblouis | 2.6.4-6.9.24 | SUSE-SU-2020:3107-1 |
| SLES 12 SP5 | python-louis | 2.6.4-6.9.39 | SUSE-SU-2020:3107-1 |
| SLES 12 SP5 | python3-louis | 2.6.4-6.9.41 | SUSE-SU-2020:3107-1 |
| SLES 11 SP4 | liblouis +1 | 1.7.0-1.3.16.1 | SUSE-SU-2019:13994-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | liblouis | 2.6.4-6.9.24 | SUSE-SU-2020:3107-1 |
| SLES for SAP 12 SP5 | python-louis | 2.6.4-6.9.39 | SUSE-SU-2020:3107-1 |
| SLES for SAP 12 SP5 | python3-louis | 2.6.4-6.9.41 | SUSE-SU-2020:3107-1 |
| SLES for SAP 11 SP4 | liblouis +1 | 1.7.0-1.3.16.1 | SUSE-SU-2019:13994-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.0 | liblouis | 3.3.0-lp150.3.3.1 | openSUSE-SU-2019:1160-1 |
Advisories 5
- USN-3782-1 liblouis vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2020:3107-1 Security update for liblouis SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1160-1 Security update for liblouis SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:13994-1 Security update for liblouis SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0795-1 Security update for liblouis SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/liblouis/liblouis/issues/635
- USN-3782-1 vendor-advisory
- 105511 vdb-entry
- https://github.com/liblouis/liblouis/commit/5e4089659bb49b3095fa541fa6387b4c40d7396e
- openSUSE-SU-2019:1160 vendor-advisory