Answer in brief
CVE-2017-16137 records a Low severity (CVSS 3.7) vulnerability in Regular Expression Denial of Service in debug. The current sources do not mark it as known exploited. The current feed maps debug (npm), debug (npm), debug (npm), debug (npm). 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 3.7. 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 debug (npm), debug (npm), debug (npm), debug (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| debugnpm | >=0 <2.6.9 | 2.6.9 |
| debugnpm | >=3.0.0 <3.1.0 | 3.1.0 |
| debugnpm | >=3.2.0 <3.2.7 | 3.2.7 |
| debugnpm | >=4.0.0 <4.3.1 | 4.3.1 |
Published upstream
Aug 9, 2018
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
Affected versions of `debug` are vulnerable to regular expression denial of service when untrusted user input is passed into the `o` formatter. As it takes 50,000 characters to block the event loop for 2 seconds, this issue is a low severity issue. This was later re-introduced in version v3.2.0, and then repatched in versions 3.2.7 and 4.3.1. ## Recommendation Version 2.x.x: Update to version 2.6.9 or later. Version 3.1.x: Update to version 3.1.0 or later. Version 3.2.x: Update to version 3.2.7 or later. Version 4.x.x: Update to version 4.3.1 or later.
Quoted source text, attributed separately from HOL analysis.