CVE-2026-39823

Published: May 7, 2026Modified: Jun 17, 2026

6.1

Vector

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

Exploitability: 2.8 / Impact: 2.7

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.

Affected (2)

Products: Golang: Go

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Golang Go	Before 1.25.10
Golang Go	From 1.26.0 to 1.26.3

Related CWEs

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (4)

https://go.dev/cl/769920

Source: security@golang.org

Patch

https://go.dev/issue/78913

Source: security@golang.org

Issue Tracking

https://groups.google.com/g/golang-announce/c/qcCIEXso47M

Source: security@golang.org

Release Notes

https://pkg.go.dev/vuln/GO-2026-4982

Source: security@golang.org

Vendor Advisory

Timeline

No history available yet.