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CVE-2023-39326 A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read…

Description

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.

Affected products and versions

Product Affected versions Fixed in
net/http/internal 1.21 1.21.0-0 → < 1.21.5 1.21.5
net/http/internal 1.20 earliest → < 1.20.12 1.20.12

References

Timeline

  1. Published
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Other CVEs of net/http/internal

The 2 CVEs of net/http/internal →
CVE-2025-22871 The net/http package improperly accepts a bare LF as a line terminator in chunked data chunk-size lines 9.1 Critical
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