Description
lrzsz before 0.13.0 contains a path traversal vulnerability in the lrz receive utility's restricted mode that allows malicious ZMODEM senders to write files outside the current directory using absolute pathnames. Because checkpath() in src/lrz.c only rejects '../' sequences unless built with --enable-pubdir, attackers can send files named with absolute paths to overwrite any file writable by the receiving user.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Uwe Ohse | lrzsz | < 0.13.0 | 0.13.0 |
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 | 0.12.21rc-5 | — |
| Debian 13 | lrzsz | No fix yet | — |
| Debian 12 | lrzsz | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | lrzsz | No fix yet | — |
| Ubuntu 26.04 LTS | lrzsz | No fix yet | — |
| Ubuntu 24.04 LTS | lrzsz | No fix yet | — |
| Ubuntu 22.04 LTS | lrzsz | No fix yet | — |
| Ubuntu 20.04 LTS | lrzsz | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | lrzsz | No fix yet | — |
| Ubuntu 16.04 LTS | lrzsz | No fix yet | — |
| Ubuntu 14.04 LTS | lrzsz | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | lrzsz | 0.12.20-68.el10_3 | RHSA-2026:98585, RHSA-2026:86056 |
| RHEL 9 | lrzsz | 0.12.20-58.el9_8 | RHSA-2026:98481, RHSA-2026:89755 |
| RHEL 8 | lrzsz | 0.12.20-46.el8_10 | RHSA-2026:83525 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | lrzsz | 0.12.20-69.el10_2 | ALSA-2026:86056 |
| AlmaLinux 9 | lrzsz | 0.12.20-58.el9_8 | ALSA-2026:89755 |
| AlmaLinux 8 | lrzsz | 0.12.20-46.el8_10 | ALSA-2026:83525 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | lrzsz | 0.12.20-69.el10_2 | RLSA-2026:86056 |
| Rocky Linux 9 | lrzsz | 0.12.20-58.el9_8 | RLSA-2026:98481, RLSA-2026:89755 |
| Rocky Linux 8 | lrzsz | 0.12.20-46.el8_10 | RLSA-2026:83525 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | lrzsz | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | lrzsz | 0.12.20-69.el10_2 | ELSA-2026-86056 |
| Oracle Linux 9 | lrzsz | 0.12.20-58.el9_8 | ELSA-2026-89755 |
| Oracle Linux 8 | lrzsz | 0.12.20-46.el8_10 | ELSA-2026-83525 |
Advisories 16
- RHSA-2026:98585 Red Hat Security Advisory: lrzsz security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98481 Red Hat Security Advisory: lrzsz security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:89755 Red Hat Security Advisory: lrzsz security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:86056 Red Hat Security Advisory: lrzsz security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RLSA-2026:98481 Important: lrzsz security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 12, 2026
- WID-SEC-2026-3978 Red Hat Enterprise Linux (lrzsz): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- ALSA-2026:89755 Important: lrzsz security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:86056 Important: lrzsz security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:83525 Important: lrzsz security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RLSA-2026:89755 Important: lrzsz security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 27, 2026
- ELSA-2026-89755 Important: lrzsz security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 26, 2026
- RLSA-2026:86056 Important: lrzsz security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 22, 2026
- ELSA-2026-86056 Important: lrzsz security, bug fix, and enhancement update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Oct 20, 2026
- RLSA-2026:83525 Important: lrzsz security, bug fix, and enhancement update Rocky Linux Security Advisories · Oct 16, 2026
- RHSA-2026:83525 Red Hat Security Advisory: lrzsz security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- ELSA-2026-83525 Important: lrzsz security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 15, 2026
References
- lrzsz 0.13.0 security changes vendor-advisory
- https://ohse.de/uwe/software/lrzsz.html product
- VulnCheck Advisory: lrzsz before 0.13.0 Path Traversal via lrz Restricted Mode checkpath() third-party-advisory