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Fencer Vulns
high 7.8

CVE-2026-84838 json

Rpm: command injection in rpmuncompress via unescaped filenames passed to popen()

published 2026-09-02 2 mo ago modified 2026-11-06 3 d ago also EUVD-2026-70109

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Hardened Images 6.1.0-1.3.hum1
  • rpm hummingbird 1 6.1.0-1.3.hum1
  • rpm-cron hummingbird 1 6.1.0-1.3.hum1
  • rpm-libs hummingbird 1 6.1.0-1.3.hum1
  • rpm-sign hummingbird 1 6.1.0-1.3.hum1
  • rpm-build hummingbird 1 6.1.0-1.3.hum1
  • python3-rpm hummingbird 1 6.1.0-1.3.hum1
  • rpm-apidocs hummingbird 1 6.1.0-1.3.hum1
  • rpm-sign-libs hummingbird 1 6.1.0-1.3.hum1

red hat advisories RHSA-2026:82378

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-84838 updated cvss 7.8

rpm: Command injection in rpmuncompress via unescaped filenames passed to popen()

  • Red Hat Enterprise Linux 10 rpm
    affected: workaround, no fix available
  • Red Hat Hardened Images rpm 6.1.0-1.3.hum1, rpm-cron 6.1.0-1.3.hum1, rpm-libs 6.1.0-1.3.hum1, rpm-sign 6.1.0-1.3.hum1, rpm-build 6.1.0-1.3.hum1, python3-rpm 6.1.0-1.3.hum1, +13 more
    fixed: vendor fix RHSA-2026:82378
  • Red Hat Enterprise Linux 6 rpm, rpm-cron, rpm-libs, rpm-build, rpm-python, rpm-apidocs Red Hat Enterprise Linux 7 rpm, rpm-cron, rpm-libs, rpm-sign, rpm-build, rpm-python, +3 more Red Hat Enterprise Linux 8 rpm, rpm-cron, rpm-libs, rpm-sign, rpm-build, python3-rpm, +8 more Red Hat Enterprise Linux 9 rpm, rpm-cron, rpm-libs, rpm-sign, rpm-build, python3-rpm, +9 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

1.10% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.