CVE-2023-39326: Denial of service via chunk extensions in net/http

First published: Wed Dec 06 2023(Updated: )

A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.

Credit: security@golang.org security@golang.org

Affected Software	Affected Version	How to fix
Golang Go	<1.20.12
Golang Go	>=1.21.0-0<1.21.5
redhat/golang	<1.20.12	1.20.12
redhat/golang 1.21.0	<0	0
redhat/golang	<1.21.5	1.21.5
debian/golang-1.15	<=1.15.15-1~deb11u4
debian/golang-1.19	<=1.19.8-2

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CVE-2023-39326: Denial of service via chunk extensions in net/http

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