7.5
High
CVE-2026-97032 HTTP/2 servers could end up crashing due to inadvertently modifying its HPACK encoder concurrently
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| net/http 1.26 | earliest → < 1.26.9 | 1.26.9 |
| net/http/internal/http2 1.27 | 1.27.0-0 → < 1.27.2 | 1.27.2 |
| golang.org/x/net/http2 0.60 | earliest → < 0.60.0 | 0.60.0 |
References
- go.dev go.dev
- go.dev go.dev
- go.dev go.dev
- groups.google.com groups.google.com
- groups.google.com groups.google.com
- pkg.go.dev pkg.go.dev
Timeline
- Published
- Last modified
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