Detections
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Golang 1.25.x < 1.25.11 / 1.26.x < 1.26.4 Multiple Vulnerabilities

medium Nessus Plugin ID 318618

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Synopsis

An application installed on the remote host is affected by multiple vulnerabilities.

Description

The version of Golang running on the remote host is 1.25.x prior to 1.25.11, or 1.26.x prior to 1.26.4. It is, therefore, affected by multiple vulnerabilities:

 - (*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split 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)

 - Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
 (CVE-2026-42504)

 - When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.
 (CVE-2026-42507)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Golang Go version 1.25.11, 1.26.4 or later.

See Also

https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw

Plugin Details

Severity: Medium

ID: 318618

File Name: golang_1_25_11_1_26_4.nasl

Version: 1.3

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 6/4/2026

Updated: 6/9/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

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

CPE: cpe:/a:golang:go

Required KB Items: installed_sw/Golang Go Programming Language

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, CVE-2026-42504, CVE-2026-42507

IAVB: 2026-B-0146