Detections
Analytics

Golang: stdlib: security update to 1.25.11stdlib: security update to 1.26.4

medium Tenable Cloud Security Plugin ID 442593

Description

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

 - (*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject
 Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same
 input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of
 SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before
 building the certificate chain, this overhead occurred even for untrusted certificates. (CVE-2026-27145)

Solution

Update the stdlib library and its related packages to version 1.25.11 or later.

See Also

https://pkg.go.dev/vuln/GO-2026-5037

Plugin Details

Severity: Medium

ID: 442593

Version: Revision 1.3

Type: Local

Family: Golang

Published: 6/3/2026

Updated: 6/5/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-27145

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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: 6/2/2026

Vulnerability Publication Date: 6/2/2026

Reference Information

CVE: CVE-2026-27145