CVE-2026-97032 HTTP/2 server crash due to HPACK encoder race in net/http
A malicious client can crash Go HTTP/2 servers by triggering a race condition in the HPACK encoder via concurrent requests and settings changes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-97032?
CVE-2026-97032 is a high-severity vulnerability in golang.org/x/net/http2, published on 8 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-362
Which versions are affected by CVE-2026-97032?
4 open source packages ship an affected version, including stdlib, golang and golang.org/x/net.
| Package | Affected | Fixed in |
|---|---|---|
stdlib Go | All versions | 1.26.9 |
stdlib Go | From 1.27.0-0 | 1.27.2 |
golang Bitnami | All versions | 1.26.9, 1.27.2 |
golang.org/x/net Go | All versions | 0.60.0 |
Linux distribution packages (3)
gosec openSUSE:Tumbleweed | All versions | 2.30.0-1.1 |
skupper openSUSE:Tumbleweed | All versions | 2.2.4-1.1 |
trivy openSUSE:Tumbleweed | All versions | 0.76.1-1.1 |
How do I fix CVE-2026-97032?
Upgrade stdlib to a fixed version for your release line: 1.26.9 or 1.27.2.
Is CVE-2026-97032 being exploited?
There is no known exploitation of CVE-2026-97032 in the wild and no public exploit code.
Sources
Also known as AZL-107030, AZL-107048, AZL-107063, AZL-107081, AZL-107117, AZL-107144 and 1103 more.