Debian alert DLA-4690-1 (xz-utils)

From:
             
 
Chris Lamb <lamby@debian.org>
To:
             
 
debian-lts-announce@lists.debian.org
Subject:
             
 
[SECURITY] [DLA 4690-1] xz-utils security update
Date:
             
 
Tue, 21 Jul 2026 14:21:33 -0700
Message-ID:
             
 
<178457872296.2405119.15631756879733032518@bigcat>
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Debian LTS Advisory DLA-4690-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                           Chris Lamb
July 20, 2026                                 https://wiki.debian.org/LTS
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Package        : xz-utils
Version        : 5.2.5-2.1~deb11u2
CVE ID         : CVE-2026-34743
Debian Bug     : 1132497

It was discovered that there was a potential buffer overflow in
xz-utils, a popular data-compression utility and library.

CVE-2026-34743

    If the lzma_index_decoder function 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 therefore occur.

For Debian 11 bullseye, this problem has been fixed in version
5.2.5-2.1~deb11u2;

We recommend that you upgrade your xz-utils packages.

For the detailed security status of xz-utils please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/xz-utils

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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