Security advisory
An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-45288
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 08:46 UTC · Revision 1
Source evidence
An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.
osv:CVE-2023-45288
Complete source record
{
"id": "248c6f8f4c8e41adc29b8e40e7c3212c027b1b6728f4eb97f6d5e6ef40768a6e",
"url": "https://osv.dev/vulnerability/CVE-2023-45288",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2023-45288",
"summary": "An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.",
"evidence": "osv:CVE-2023-45288",
"products": [],
"severity": "unknown",
"structured": {
"id": "CVE-2023-45288",
"aliases": [
"BIT-golang-2023-45288",
"CVE-2023-45288",
"GHSA-4v7x-pqxf-cx7m",
"GO-2024-2687"
],
"affected": [],
"modified": "2026-10-07T17:26:55.617298425Z",
"provider": "osv",
"references": [
"https://security.netapp.com/advisory/ntap-20240419-0009/",
"https://go.dev/cl/576155",
"https://go.dev/issue/65051",
"https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M",
"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT/",
"https://pkg.go.dev/vuln/GO-2024-2687"
]
},
"related_cves": [
{
"value": "CVE-2023-45288",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 97058,
"published_at": "2024-04-04T21:15:16+00:00"
}