CVE-2026-33169GHSA-CG4J-Q9V8-6V38
Rails Active Support has a possible ReDoS vulnerability in number_to_delimited
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 8.1.2.1, 8.0.4.1, 7.2.3.1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- rails activesupport
From 8.1.0.beta1 · fixed in 8.1.2.1; From 8.0.0.beta1 · fixed in 8.0.4.1; fixed in 7.2.3.1
- activesupportRubyGems
From 8.1.0.beta1 · fixed in 8.1.2.1
- activesupportRubyGems
From 8.0.0.beta1 · fixed in 8.0.4.1
- activesupportRubyGems
fixed in 7.2.3.1