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.
{
"cna_assigner": "Go",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/39xxx/CVE-2023-39326.json",
"unresolved_ranges": [
{
"extracted_events": [
{
"fixed": "1.20.12"
},
{
"introduced": "1.21.0-0"
},
{
"fixed": "1.21.5"
}
],
"source": "AFFECTED_FIELD"
}
]
}{
"extracted_events": [
{
"introduced": "0"
},
{
"fixed": "1.20.12"
},
{
"introduced": "1.21.0-0"
},
{
"fixed": "1.21.5"
}
],
"cpe": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
"source": "CPE_FIELD"
}