Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-33169

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. `NumberToDelimitedConverter` uses a lookahead-based regular expression with `gsub!` to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and `gsub!` can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.7%
CVSS Severity
CVSS v3 Score 5.3
Products affected by CVE-2026-33169


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