title: Excessive memory allocation in net/http and net/textproto
description: HTTP and MIME header parsing can allocate large amounts of memory, even when parsing small inputs, potentially leading to a denial of service. Certain unusual patterns of input data can cause the common function used to parse HTTP and MIME headers to allocate substantially more memory than required to hold the parsed headers. An attacker can exploit this behavior to cause an HTTP server to allocate large amounts of memory from a small request, potentially leading to memory exhaustion and a denial of service. With fix, header parsing now correctly allocates only the memory required to hold parsed headers.
problem types: CWE-400: Uncontrolled Resource Consumption
affected:
{
vendor: Go standard library
product: net/textproto
collectionURL: https://pkg.go.dev
packageName: net/textproto
versions:
version: 0, lessThan: 1.19.8, status: affected, versionType: semver
version: 1.20.0-0, lessThan: 1.20.3, status: affected, versionType: semver
programRoutines:
name: readMIMEHeader
name: Reader.upcomingHeaderNewlines
name: Reader.ReadMIMEHeader
defaultStatus: unaffected
}