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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2026-33169

Rails Active Support has a possible ReDoS vulnerability in number_to_delimited

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

rails activesupport

  • >= 8.1.0.beta1, < 8.1.2.1affected
  • >= 8.0.0.beta1, < 8.0.4.1affected
  • < 7.2.3.1affected

References