Description
UnRAR 5.6.1.2 and 5.6.1.3 has a heap-based buffer overflow in Unpack::CopyString (called from Unpack::Unpack5 and CmdExtract::ExtractCurrentFile).
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 | 1:5.6.6-1 | — |
| Debian 13 | unrar-nonfree | 1:5.6.6-1 | — |
| Debian 12 | unrar-nonfree | 1:5.6.6-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | unrar-nonfree | No fix yet | — |
| 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 |
Show 6 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 |
| 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 1
- SUSE-SU-2021:2834-1 Security update for unrar SUSE / openSUSE Security Updates · Feb 4, 2026