A flaw was found in rpmuncompress. This command injection vulnerability allows a local attacker to execute arbitrary commands. This occurs when rpmuncompress processes a specially crafted archive filename containing shell metacharacters, which are not properly escaped before being passed to shell command strings. Successful exploitation requires user interaction, where a user or automated workflow invokes rpmuncompress on the malicious file, leading to high impact on the confidentiality, integrity, and availability of data accessible to the invoking user.

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Fixes

Solution

No solution given by the vendor.


Workaround

To mitigate this issue, avoid processing untrusted archive filenames with `rpmuncompress` or any workflows that invoke `%{__rpmuncompress}`. Before any build or extraction steps, rename source and patch archives to remove any shell metacharacters from their filenames.

History

Thu, 03 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 02 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 02 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in rpmuncompress. This command injection vulnerability allows a local attacker to execute arbitrary commands. This occurs when rpmuncompress processes a specially crafted archive filename containing shell metacharacters, which are not properly escaped before being passed to shell command strings. Successful exploitation requires user interaction, where a user or automated workflow invokes rpmuncompress on the malicious file, leading to high impact on the confidentiality, integrity, and availability of data accessible to the invoking user.
Title Rpm: command injection in rpmuncompress via unescaped filenames passed to popen()
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Weaknesses CWE-78
CPEs cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-02T16:24:26.541Z

Reserved: 2026-09-02T11:56:41.213Z

Link: CVE-2026-84838

cve-icon Vulnrichment

Updated: 2026-09-02T16:07:53.861Z

cve-icon NVD

Status : Received

Published: 2026-09-02T16:17:33.710

Modified: 2026-09-02T17:18:06.037

Link: CVE-2026-84838

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-02T13:35:12Z

Links: CVE-2026-84838 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-03T12:00:04Z

Weaknesses