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.

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Fixes

Solution

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Workaround

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History

Fri, 09 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362

Fri, 09 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362

Fri, 09 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-366
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate


Thu, 08 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
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.
Title HTTP/2 server crash due to HPACK encoder race in net/http
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-10-08T22:54:00.230Z

Reserved: 2026-09-23T23:03:58.333Z

Link: CVE-2026-97032

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-08T23:17:06.213

Modified: 2026-10-08T23:17:06.213

Link: CVE-2026-97032

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-08T22:54:00Z

Links: CVE-2026-97032 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-09T03:30:06Z

Weaknesses