Description
A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Discovery 2 | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Update Infrastructure 5 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
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 | tar | No fix yet | — |
| Debian 13 | tar | No fix yet | — |
| Debian 12 | tar | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tar | No fix yet | — |
| Ubuntu 26.04 LTS | tar | No fix yet | — |
| Ubuntu 24.04 LTS | tar | No fix yet | — |
| Ubuntu 22.04 LTS | tar | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | tar | No fix yet | — |
| Ubuntu Pro 18.04 LTS | tar | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tar | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tar | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | tar | 2:1.35-13.el10_2 | RHSA-2026:61586 |
| RHEL 9 | tar | 2:1.34-13.el9_8 | RHSA-2026:61581 |
| RHEL 8 | tar | 2:1.30-13.el8_10 | RHSA-2026:70390 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | tar | 1.35-9.2.hum1 | RHSA-2026:50807 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | tar | 2:1.35-13.el10_2 | ALSA-2026:61586 |
| AlmaLinux 9 | tar | 2:1.34-13.el9_8 | ALSA-2026:61581 |
| AlmaLinux 8 | tar | 2:1.30-13.el8_10 | ALSA-2026:70390 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | tar | 2:1.35-13.el10_2 | RLSA-2026:61586 |
| Rocky Linux 9 | tar | 2:1.34-13.el9_8 | RLSA-2026:61581 |
| Rocky Linux 8 | tar | 2:1.30-13.el8_10 | RLSA-2026:70390 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | tar | 1.34-150000.3.45.1 | SUSE-SU-2026:5160-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.5 | tar | 1.34-150000.3.45.1 | SUSE-SU-2026:5160-1 |
| SLE Micro 5.4 | tar | 1.34-150000.3.45.1 | SUSE-SU-2026:5160-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | tar | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | tar | 2:1.30-13.el8_10 | ELSA-2026-70390 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | gnutar +2 | No fix yet | — |
Advisories 13
- WID-SEC-2026-2633 GNU tar: Mehrere Schwachstellen ermöglichen Manipulation von Dateien BSI CERT-Bund (WID) · Nov 10, 2026
- SUSE-SU-2026:5160-1 Security update for tar SUSE / openSUSE Security Updates · Nov 10, 2026
- ALSA-2026:61581 Moderate: tar security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:61586 Moderate: tar security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:70390 Moderate: tar security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RLSA-2026:70390 Moderate: tar security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 24, 2026
- RHSA-2026:70390 Red Hat Security Advisory: tar security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 23, 2026
- RHSA-2026:61586 Red Hat Security Advisory: tar security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 23, 2026
- RHSA-2026:61581 Red Hat Security Advisory: tar security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 23, 2026
- RHSA-2026:50807 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Sep 23, 2026
- ELSA-2026-70390 Moderate: tar security, bug fix, and enhancement update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Sep 23, 2026
- RLSA-2026:61586 Moderate: tar security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 11, 2026
- RLSA-2026:61581 Moderate: tar security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 1, 2026
References
- RHSA-2026:50807 vendor-advisory
- RHSA-2026:61581 vendor-advisory
- RHSA-2026:61586 vendor-advisory
- RHSA-2026:61783 vendor-advisory
- RHSA-2026:66018 vendor-advisory
- RHSA-2026:70390 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-18508 vdb-entry
- RHBZ#2509843 issue-tracking