Description
lrzsz before version 0.12.21~rc can leak information to the receiving side due to an incorrect length check in the function zsdata that causes a size_t to wrap around.
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 | lrzsz | 0.12.21-10 | — |
| Debian 13 | lrzsz | 0.12.21-10 | — |
| Debian 12 | lrzsz | 0.12.21-10 | — |
| Debian 9 | lrzsz | 0.12.21-8+deb9u1 | DLA-2900-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | lrzsz | 0.12.21-10~build0.18.04.1 | — |
| Ubuntu 16.04 LTS | lrzsz | 0.12.21-10~build0.16.04.1 | — |
| Ubuntu 14.04 LTS | lrzsz | 0.12.21-10~build0.14.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | rzsz | 0.12.21~rc-1001.3.1 | SUSE-SU-2018:1066-1 |
| SLES 11 SP4 | rzsz | 0.12.21~rc-936.3.1 | SUSE-SU-2018:1070-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | rzsz | 0.12.21~rc-1001.3.1 | SUSE-SU-2018:1066-1 |
| SLES for SAP 11 SP4 | rzsz | 0.12.21~rc-936.3.1 | SUSE-SU-2018:1070-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | rzsz | 0.12.21~rc-4.5 | openSUSE-SU-2024:11363-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | lrzsz | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | lrzsz | No fix yet | — |
Advisories 4
- DLA-2900-1 lrzsz - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:1070-1 Security update for rzsz SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11363-1 rzsz-0.12.21~rc-4.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1066-1 Security update for rzsz SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www.ohse.de/uwe/software/lrzsz.html
- https://lists.suse.com/pipermail/sle-security-updates/2018-April/003955.html?_ga=2.81625751.1026327980.1622040648-1950393542.1547130931
- https://lists.suse.com/pipermail/sle-security-updates/2018-April/003956.html?_ga=2.81625751.1026327980.1622040648-1950393542.1547130931
- https://bugzilla.redhat.com/show_bug.cgi?id=1572058
- [debian-lts-announce] 20220125 [SECURITY] [DLA 2900-1] lrzsz security update mailing-list