# CVE-2026-12545: Rubygem-hammer_cli: command injection via insecure editor invocation

Status: published. Published: 2026-10-01. Updated: 2026-11-02.

A flaw was found in rubygem-hammer_cli. A command injection vulnerability exists in Hammer CLI and the Railties (Ruby on Rails) component distributed with Satellite due to the insecure interpolation of the $EDITOR environment variable into the Ruby system() method. By passing a single interpolated string to system(), the application invokes a system shell (/bin/sh) that interprets shell metacharacters (e.g., ;, |, &).

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Satellite 6.16 for RHEL 8 (rubygem-hammer_cli): ≥ 0:3.12.0-2.el8sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6.16 for RHEL 9 (rubygem-hammer_cli): ≥ 0:3.12.0-2.el9sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6.17 for RHEL 9 (rubygem-hammer_cli): ≥ 0:3.14.0-2.el9sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6.18 for RHEL 9 (rubygem-hammer_cli): ≥ 0:3.16.0-2.el9sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6.19 for RHEL 9 (rubygem-hammer_cli): ≥ 0:3.18.0-2.el9sat; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Satellite 6 (satellite-utils:el8/rubygem-hammer_cli): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.52% as of 2026-11-02; percentile 44.37%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-78

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:74503 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:74504 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:74505 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:74506 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-12545 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2489993 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- http://www.openwall.com/lists/oss-security/2026/10/07/5 (ADP: CVE)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-12545; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-12545; retrieved 2026-11-02; source updated Not reported

Revision: 536aab1a4ee3efb60063e4daf8e24c90aa67735d741e33fe2b2f07f740174c8c

Canonical: https://y2.dev/cve/CVE-2026-12545

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