Detections
Analytics

RHEL 10 : xz (RHSA-2026:64787)

medium Nessus Plugin ID 343803

Synopsis

The remote Red Hat host is missing a security update for xz.

Description

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:64787 advisory.

 XZ Utils is an integrated collection of user-space file compression utilities based on the Lempel-Ziv- Markov chain algorithm (LZMA), which performs lossless data compression. The algorithm provides a high compression ratio while keeping the decompression time short.

 Security Fix(es):

 * xz: XZ Utils: Denial of Service via buffer overflow in index decoding (CVE-2026-34743)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL xz package based on the guidance in RHSA-2026:64787.

See Also

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

https://access.redhat.com/security/updates/classification/#moderate

https://bugzilla.redhat.com/show_bug.cgi?id=2454589

http://www.nessus.org/u?3389d8b8

Plugin Details

Severity: Medium

ID: 343803

File Name: redhat-RHSA-2026-64787.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/8/2026

Updated: 9/8/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-34743

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:10.2, p-cpe:/a:redhat:enterprise_linux:xz-devel, p-cpe:/a:redhat:enterprise_linux:xz-libs, p-cpe:/a:redhat:enterprise_linux:xz-lzma-compat, p-cpe:/a:redhat:enterprise_linux:xz

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 4/2/2026

Reference Information

CVE: CVE-2026-34743

CWE: 131

RHSA: 2026:64787