Vulnerability Intelligence Report
HTTP/2 server crash due to HPACK encoder race in net/http
CVE-2026-97032
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.
No Active Exploit Signals
CVSS Base Score
7.5
HIGH
Exploitability:3.9
Impact Score:3.6
EPSS Probability:0.18%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-362 ↗CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Go standard library | net/http | 0 < 1.26.9 (affected) |
| Go standard library | net/http/internal/http2 | 1.27.0-0 < 1.27.2 (affected) |
| golang.org/x/net | golang.org/x/net/http2 | 0 < 0.60.0 (affected) |
Threat Intelligence Signals
EPSS Score
0.181%
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Go Project · Vendor · USA |
| Reserved | 2026-09-23T23:03:58 |
| Published | 2026-10-08T22:54:00 |
| Last Updated | 2026-10-15T15:46:39 |
Community Chatter & Buzz