Description
XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| tukaani-project | xz | < 5.8.3 | — |
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 | xz-utils | 5.8.3-1 | — |
| Debian 13 | xz-utils | 5.8.1-1+deb13u1 | — |
| Debian 12 | xz-utils | 5.4.1-1+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | xz-utils | 5.8.1-1ubuntu0.1 | USN-8362-1 |
| Ubuntu 24.04 LTS | xz-utils | 5.6.1+really5.4.5-1ubuntu0.3 | USN-8362-1 |
| Ubuntu 22.04 LTS | xz-utils | 5.2.5-2ubuntu1.1 | USN-8362-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | xz-utils | 5.2.4-1ubuntu1.1+esm1 | USN-8362-1 |
| Ubuntu Pro 18.04 LTS | xz-utils | 5.2.2-1.3ubuntu0.1+esm1 | USN-8362-1 |
| Ubuntu Pro 16.04 LTS | xz-utils | 5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2 | USN-8362-1 |
| Ubuntu Pro 14.04 LTS | xz-utils | 5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2 | USN-8362-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | xz +3 | 1:5.6.2-4.el10_2.1 | RHSA-2026:64787 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | xz +4 | 5.8.3-1.1.hum1 | RHSA-2026:7647 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | xz +3 | 1:5.6.2-4.el10_2.1 | ALSA-2026:64787 |
| AlmaLinux 9 | xz +3 | 5.2.5-8.el9_8.1 | ALSA-2026:89749 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | xz | 1:5.6.2-4.el10_2.1 | RLSA-2026:64787 |
| Rocky Linux 9 | xz | 5.2.5-8.el9_8.1 | RLSA-2026:98486, RLSA-2026:89749 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xz | 5.8.3-1.1 | openSUSE-SU-2026:10492-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xz | 5.8.3-r0 | — |
| Alpine v3.23 | xz | 5.8.3-r0 | — |
| Alpine v3.22 | xz | 5.8.3-r0 | — |
| Alpine v3.21 | xz | 5.8.3-r0 | — |
| Alpine v3.20 | xz | 5.8.3-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | rust | 1.75.0-28 | — |
| Azure Linux 3 | xz | 5.4.4-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | xz +3 | 5.2.5-8.el9_8.1 | ELSA-2026-89749 |
Advisories 11
- WID-SEC-2026-0942 xz: Schwachstelle ermöglicht Codeausführung BSI CERT-Bund (WID) · Nov 12, 2026
- RLSA-2026:98486 Moderate: xz security update Rocky Linux Security Advisories · Nov 12, 2026
- ALSA-2026:89749 Moderate: xz security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:64787 Moderate: xz security update AlmaLinux Security Advisories · Oct 29, 2026
- RLSA-2026:89749 Moderate: xz security update Rocky Linux Security Advisories · Oct 27, 2026
- ELSA-2026-89749 Moderate: xz security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 26, 2026
- RHSA-2026:7647 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:64787 Red Hat Security Advisory: xz security update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RLSA-2026:64787 Moderate: xz security update Rocky Linux Security Advisories · Sep 9, 2026
- USN-8362-1 xz-utils vulnerability Ubuntu Security Notices (USN) · Jun 2, 2026
- openSUSE-SU-2026:10492-1 liblzma5-32bit-5.8.3-1.1 on GA media SUSE / openSUSE Security Updates · Apr 5, 2026