Answer in brief
CVE-2026-21710 records a High severity (CVSS 7.5) vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps nodejs/node (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-21710 records a High severity (CVSS 7.5) vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps nodejs/node (generic). 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 7.5. 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 nodejs/node (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| nodejs/nodegeneric | 20.20.1 || 22.22.1 || 24.14.0 || 25.8.1 || >=4.0 <4.* || >=5.0 <5.* || >=6.0 <6.* || >=7.0 <7.* || >=8.0 <8.* || >=9.0 <9.* || >=10.0 <10.* || >=11.0 <11.* || >=12.0 <12.* || >=13.0 <13.* || >=14.0 <14.* || >=15.0 <15.* || >=16.0 <16.* || >=17.0 <17.* || >=18.0 <18.* || >=19.0 <19.* | 4.*, 5.*, 6.*, 7.*, 8.*, 9.*, 10.*, 11.*, 12.*, 13.*, 14.*, 15.*, 16.*, 17.*, 18.*, 19.* |
Published upstream
Mar 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
A flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `__proto__` and the application accesses `req.headersDistinct`. When this occurs, `dest["__proto__"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by `error` event listeners, meaning it cannot be handled without wrapping every `req.headersDistinct` access in a `try/catch`. * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.5. 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 nodejs/node (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| nodejs/nodegeneric | 20.20.1 || 22.22.1 || 24.14.0 || 25.8.1 || >=4.0 <4.* || >=5.0 <5.* || >=6.0 <6.* || >=7.0 <7.* || >=8.0 <8.* || >=9.0 <9.* || >=10.0 <10.* || >=11.0 <11.* || >=12.0 <12.* || >=13.0 <13.* || >=14.0 <14.* || >=15.0 <15.* || >=16.0 <16.* || >=17.0 <17.* || >=18.0 <18.* || >=19.0 <19.* | 4.*, 5.*, 6.*, 7.*, 8.*, 9.*, 10.*, 11.*, 12.*, 13.*, 14.*, 15.*, 16.*, 17.*, 18.*, 19.* |
Published upstream
Mar 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
A flaw in Node.js HTTP request handling causes an uncaught `TypeError` when a request is received with a header named `__proto__` and the application accesses `req.headersDistinct`. When this occurs, `dest["__proto__"]` resolves to `Object.prototype` rather than `undefined`, causing `.push()` to be called on a non-array. This exception is thrown synchronously inside a property getter and cannot be intercepted by `error` event listeners, meaning it cannot be handled without wrapping every `req.headersDistinct` access in a `try/catch`. * This vulnerability affects all Node.js HTTP servers on **20.x, 22.x, 24.x, and v25.x**
Quoted source text, attributed separately from HOL analysis.