CVE-2026-33169

CWE-400 — Uncontrolled Resource ConsumptionCWE-13338 documents7 sources
Severity
6.9MEDIUM
EPSS
0.0%
top 95.14%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Rails ActivesupportRubyonrails Rails
Timeline
PublishedMar 24

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.

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected Packages3 packages

▶CVEListV5rails/activesupport< 7.2.3.1+2
▶RubyGemsactivesupport8.1.0.beta1 — 8.1.2.1+2
▶NVDrubyonrails/rails8.0.0 — 8.0.4.1+2

Patches

Patch: github.com ↗Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

4
OSV
CVE-2026-33169: Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework↗2026-03-24
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CVEList
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited↗2026-03-23
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OSV
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited↗2026-03-23
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GHSA
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited↗2026-03-23
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📋Vendor Advisories

2
Red Hat
rails: rails-activesupport: Active Support: Denial of Service via crafted long digit strings↗2026-03-23
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Debian
CVE-2026-33169: rails - Active Support is a toolkit of support libraries and Ruby core extensions extrac...↗2026
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🕵️Threat Intelligence

1
Wiz
CVE-2026-33169 Impact, Exploitability, and Mitigation Steps | Wiz↗
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