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Debian LTS Advisory DLA-4690-1 [email protected]
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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