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

high Tenable Cloud Security Plugin ID 473928

Description

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

- When "Trailer" headers are sent by a client, the HTTP server internally uses the header values to populate
the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs
memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a "Trailer" header
that declares a large number of fields, causing the server to allocate a disproportionate amount of memory
while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits. This exploit is not
applicable for HTTP/1 servers, which do not support multiplexing a large number of requests over one TCP
connection, and whose Server.MaxHeaderBytes are calculated differently. (CVE-2026-78659)

Solution

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

Plugin Details

Severity: High

ID: 473928

Version: Revision 1.1

Type: Local

Family: Golang

Published: 10/9/2026

Updated: 10/9/2026

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-78659

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-2026-78659

Detections

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