CVE-2026-97032
HTTP/2 server crash due to HPACK encoder race in net/http
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | go standard library |
| Product | net/http |
| Published | Oct 8, 2026 |
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Affected Versions
Go standard library / net/http
0 < 1.26.9
Go standard library / net/http/internal/http2
1.27.0-0 < 1.27.2
golang.org/x/net / golang.org/x/net/http2
0 < 0.60.0
References
go.dev: https://go.dev/cl/847188 go.dev: https://go.dev/cl/847313 go.dev: https://go.dev/issue/81867 groups.google.com: https://groups.google.com/g/golang-announce/c/U2fTuyDJznI groups.google.com: https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-6617
Credits
RyotaK (https://ryotak.net) of GMO Flatt Security Inc.