Golang: stdlib: security update to 1.26.9stdlib: security update to 1.27.2

critical Tenable Cloud Security Plugin ID 473918

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client
resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request
handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-
level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the
concurrent stream limit and stream-level flow control. (CVE-2026-78663)

Solution

Update the stdlib library and its related packages to version 1.26.9 or later.

Plugin Details

Severity: Critical

ID: 473918

Version: Revision 1.1

Type: Local

Family: Golang

Published: 10/9/2026

Updated: 10/9/2026

Risk Information

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:C

CVSS Score Source: CVE-2026-78663

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/8/2026

Vulnerability Publication Date: 10/8/2026

Reference Information

CVE: CVE-2026-78663

Detections

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