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CVE-2026-33176 — Rails Active Support has a possible DoS vulnerability in its number helpers

2026-10-01T07:46:35.447974+00:00

Affected: rails activesupport

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which `BigDecimal` expands into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

GHSA-2j26-frm8-cmj9 — Rails Active Support has a possible DoS vulnerability in its number helpers

2026-10-01T07:46:35.448099+00:00

Affected: RubyGems: activesupport

### Impact Active Support number helpers accept strings containing scientific notation (e.g. `1e10000`), which when converted to a string could be expanded into extremely large decimal representations. This can cause excessive memory allocation and CPU consumption when the expanded number is formatted, possibly resulting in a DoS vulnerability.

### Releases The fixed releases are available at the normal locations.

### Credit This issue was responsibly reported by Hackerone researcher [manun](https://hackerone.com/manun).