CVE-2026-97032
HTTP/2 server crash due to HPACK encoder race in net/http
- State
- Published
- Severity
- 7.5 High
- Published
- Oct 8, 2026
- Updated
- Oct 15, 2026
- Reserved
- Sep 23, 2026
Description
HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently. This happens because the server modifies the HPACK encoder from two goroutines without synchronization: one uses the encoder to encode a HEADERS frame as part of a response sent to a client and the other modifies the encoder's table size when handling a SETTINGS frame containing SETTINGS_HEADER_TABLE_SIZE that a client sends. A malicious client can repeatedly send a request while changing the header table size to crash the server.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Products
| Product | Versions |
|---|---|
net/httpGo standard library |
|
net/http/internal/http2Go standard library |
|
golang.org/x/net/http2golang.org/x/net |
|
References
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