CVE-2026-84838

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.

Affected Software

Weaknesses

• CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Workarounds

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.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://access.redhat.com/security/cve/CVE-2026-84838
• https://bugzilla.redhat.com/show_bug.cgi?id=2462222

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