Vulnerability · Published Sep 2, 2026 · Assigned by redhat
CVE-2026-84838Rpm: command injection in rpmuncompress via unescaped filenames passed to popen()
High 7.8
In plain English
A high-severity OS command injection in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rpm | no fix listed | DEBIAN-CVE-2026-84838 |
| Debian:13 | rpm | no fix listed | DEBIAN-CVE-2026-84838 |
| Debian:14 | rpm | no fix listed | DEBIAN-CVE-2026-84838 |
| Ubuntu:22.04:LTS | rpm | no fix listed | UBUNTU-CVE-2026-84838 |
| Ubuntu:24.04:LTS | rpm | no fix listed | UBUNTU-CVE-2026-84838 |
| Ubuntu:26.04:LTS | rpm | no fix listed | UBUNTU-CVE-2026-84838 |
| Ubuntu:26.10 | rpm | no fix listed | UBUNTU-CVE-2026-84838 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- RHSA-2026:82378 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-84838 vdb-entry, x_refsource_REDHAT
- RHBZ#2462222 issue-tracking, x_refsource_REDHAT