Bug 2454589 (CVE-2026-34743) - CVE-2026-34743 xz: XZ Utils: Denial of Service via buffer overflow in index decoding
Summary: CVE-2026-34743 xz: XZ Utils: Denial of Service via buffer overflow in index d...
Keywords:
Status: NEW
Alias: CVE-2026-34743
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-02 19:03 UTC by OSIDB Bzimport
Modified: 2026-09-11 14:53 UTC (History)
17 users (show)

Fixed In Version:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:64787 0 None None None 2026-09-08 05:30:47 UTC

Description OSIDB Bzimport 2026-04-02 19:03:20 UTC 
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.
Comment 2 errata-xmlrpc 2026-09-08 05:30:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:64787 https://access.redhat.com/errata/RHSA-2026:64787
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