Description
libunrar.a in UnRAR before 5.5.7 has an out-of-bounds read in the EncodeFileName::Decode call within the Archive::ReadHeader15 function.
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 | unrar-nonfree | 1:5.5.8-1 | — |
| Debian 13 | unrar-nonfree | 1:5.5.8-1 | — |
| Debian 12 | unrar-nonfree | 1:5.5.8-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | unrar-nonfree | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES 12 SP4 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES 12 SP3 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES 12 SP2 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES 11 SP4 | unrar | 5.6.1-5.3.1 | SUSE-SU-2018:0862-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES for SAP 12 SP4 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES for SAP 12 SP3 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SLES for SAP 11 SP4 | unrar | 5.6.1-5.3.1 | SUSE-SU-2018:0862-1 |
| SUSE OpenStack Cloud Crowbar 9 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SUSE OpenStack Cloud 9 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
| SUSE OpenStack Cloud 8 | unrar | 5.6.1-4.5.1 | SUSE-SU-2021:2834-1 |
Advisories 2
- SUSE-SU-2021:2834-1 Security update for unrar SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0862-1 Security update for unrar SUSE / openSUSE Security Updates · Feb 4, 2026