Red Hat
Rubygem-safemode: safemode: jail allow-list bypass via op-assign expressions
Not on CISA's list of exploited flaws, and not in the news we track.
CVE-2026-107360Critical9.6
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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.
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Severity
9.6of 10, critical
Updated 13 Nov 2026, 11:42 UTC, 31 of 36 sources answering.
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