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Fencer Intel
critical 9.6

CVE-2026-107360 json

Rubygem-safemode: safemode: jail allow-list bypass via op-assign expressions

published 2d ago modified yesterday also EUVD-2026-124669

cvss
9.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

A flaw was found in rubygem-safemode. Compound assignment expressions in sandboxed code are evaluated without mediating method calls through the Jail allow-list. An authenticated attacker who can supply template content can invoke arbitrary no-argument methods on objects exposed to the template renderer without Jail mediation, including destructive operations such as host deletion and disclosure of non-allow-listed object state.

Patch / fix

  • Red Hat Red Hat Satellite 6.16 for RHEL 8 0:1.5.0-3.el8sat
  • Red Hat Red Hat Satellite 6.16 for RHEL 9 0:1.5.0-3.el9sat
  • Red Hat Red Hat Satellite 6.17 for RHEL 9 0:1.5.0-3.el9sat
  • Red Hat Red Hat Satellite 6.18 for RHEL 9 0:1.5.0-3.el9sat
  • Red Hat Red Hat Satellite 6.19 for RHEL 9 0:1.5.0-3.el9sat

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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-2026-107360 updated cvss 9.6

rubygem-safemode: safemode: Jail allow-list bypass via op-assign expressions

  • Red Hat Satellite 6.16 for RHEL 8 rubygem-safemode 1.5.0-3.el8sat Red Hat Satellite 6.16 for RHEL 9 rubygem-safemode 1.5.0-3.el9sat
    fixed: vendor fix RHSA-2026:99949
  • Red Hat Satellite 6.17 for RHEL 9 rubygem-safemode 1.5.0-3.el9sat
    fixed: vendor fix RHSA-2026:99950
  • Red Hat Satellite 6.18 for RHEL 9 rubygem-safemode 1.5.0-3.el9sat
    fixed: vendor fix RHSA-2026:99952
  • Red Hat Satellite 6.19 for RHEL 9 rubygem-safemode 1.5.0-3.el9sat
    fixed: vendor fix RHSA-2026:100120
  • Red Hat Satellite 6.16 for RHEL 8 candlepin 4.4.26-2.el8sat, foreman 3.12.0.26-1.el8sat, satellite 6.16.15-1.el8sat, python-pyjwt 2.15.1-1.el8pc, rubygem-puma 6.4.3-2.el8sat, rubygem-crass 1.0.8-1.el8sat, +30 more Red Hat Satellite 6.16 for RHEL 9 candlepin 4.4.26-2.el9sat, foreman 3.12.0.26-1.el9sat, satellite 6.16.15-1.el9sat, python-pyjwt 2.15.1-1.el9pc, rubygem-puma 6.4.3-2.el9sat, rubygem-crass 1.0.8-1.el9sat, +30 more Red Hat Satellite 6.17 for RHEL 9 candlepin 4.4.26-2.el9sat, foreman 3.14.0.26-1.el9sat, satellite 6.17.13-1.el9sat, python-pyjwt 2.15.1-1.el9pc, rubygem-puma 6.6.0-2.el9sat, rubygem-crass 1.0.8-1.el9sat, +35 more Red Hat Satellite 6.18 for RHEL 9 candlepin 4.6.7-2.el9sat, foreman 3.16.0.29-1.el9sat, satellite 6.18.11-1.el9sat, rubygem-puma 6.6.1-2.el9sat, rubygem-crass 1.0.8-1.el9sat, ansible-core 2.16.19-4.el9sat, +27 more Red Hat Satellite 6.19 for RHEL 9 candlepin 4.7.7-2.el9sat, satellite 6.19.6-1.el9sat, createrepo_c 1.2.6-1.el9pc, foreman 3.18.0.19-1.el9sat, rubygem-crass 1.0.8-1.el9sat, satellite-cli 6.19.6-1.el9sat, +34 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
yesterday

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-14).

CVSS scores

assigned by version score vector
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

  • Red Hat Red Hat Satellite 6.16 for RHEL 8
  • Red Hat Red Hat Satellite 6.16 for RHEL 9
  • Red Hat Red Hat Satellite 6.17 for RHEL 9
  • Red Hat Red Hat Satellite 6.18 for RHEL 9
  • Red Hat Red Hat Satellite 6.19 for RHEL 9

Classification

Weakness
  • CWE-183 Permissive List of Allowed Inputs

References

Sources

Fencer Intel 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.