AZL-81239

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Import Source
https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-81239.json
JSON Data
https://api.test.osv.dev/v1/vulns/AZL-81239
Upstream
Published
2026-03-30T20:16:18Z
Modified
2026-08-28T17:47:43Z
Summary
CVE-2026-21710 affecting package nodejs for versions less than 20.14.0-15
Details

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
References

Affected packages

Azure Linux:3 / nodejs

Package

Name
nodejs
Purl
pkg:rpm/azure-linux/nodejs

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
20.14.0-15

Database specific

source 
"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-81239.json"