CVE-2026-78663: Double flow control refund on HTTP/2 server streams in net/http

Overview

Severity

Critical (CVSS 9.1)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Oct

Released

2026-10-11

Last Updated

2026-10-12

EPSS Score

0.57% (percentile: 45.8%)

Affected Products (1)

Other

• 17793-17084

Revision History

• 2026-10-11: Information published.
• 2026-10-12: Information published.