Answer in brief
CVE-2024-25126 records a Medium severity (CVSS 5.3) vulnerability in Rack vulnerable to ReDoS in content type parsing (2nd degree polynomial). The current sources do not mark it as known exploited. The current feed maps rack (rubygems), rack (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps rack (rubygems), rack (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| rackrubygems | >=3.0.0 <3.0.9.1 | 3.0.9.1 |
| rackrubygems | >=0.4 <2.2.8.1 | 2.2.8.1 |
Published upstream
Feb 28, 2024
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
### Summary ```ruby module Rack class MediaType SPLIT_PATTERN = %r{\s*[;,]\s*} ``` The above regexp is subject to ReDos. 50K blank characters as a prefix to the header will take over 10s to split. ### PoC A simple HTTP request with lots of blank characters in the content-type header: ```ruby request["Content-Type"] = (" " * 50_000) + "a," ``` ### Impact It's a very easy to craft ReDoS. Like all ReDoS the impact is debatable.
Quoted source text, attributed separately from HOL analysis.