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Fencer Vulns
high 7.0

CVE-2026-84233 json

Rpm: command execution via macro expansion in `rpmuncompress -x` for crafted `.gem` filenames

published 2026-09-01 2 mo ago modified 2026-11-06 3 d ago also EUVD-2026-69249

cvss
7.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

A flaw was found in rpm. A local attacker could supply a specially crafted `.gem` filename containing RPM macro syntax. When a user or automated workflow invokes `rpmuncompress -x` on this file, the macro expansion occurs during command construction. This allows the attacker to execute arbitrary commands with the privileges of the invoking account, leading to a compromise of confidentiality, integrity, and availability.

Patch / fix

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

red hat advisories RHSA-2026:66637

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-2026-84233 updated cvss 7.0

rpm: Command Execution via Macro Expansion in `rpmuncompress -x` for Crafted `.gem` Filenames

  • Red Hat Enterprise Linux 10 rpm
    affected: workaround, no fix available
  • Red Hat Hardened Images rpm 6.1.0-1.hum1, rpm-cron 6.1.0-1.hum1, rpm-libs 6.1.0-1.hum1, rpm-sign 6.1.0-1.hum1, rpm-build 6.1.0-1.hum1, python3-rpm 6.1.0-1.hum1, +13 more
    fixed: vendor fix RHSA-2026:66637
  • 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

0.19% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.0 CVSS:3.1/AV:L/AC:H/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.