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CVE-2026-27142

CVE-2026-27142 · URLs in meta content attribute actions are not escaped in html/template

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh". A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow "url=" by setting htmlmetacontenturlescape=0.

CVSS 6.1 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • html/template

    Versions
    • ≥ 0, < 1.25.8: Affected (semver)
    • ≥ 1.26.0-0, < 1.26.1: Affected (semver)

    Update to 1.25.8; Update to 1.26.1

  • golang-1.19 Debian:12

    Versions
    • 1.19.10-1
    • 1.19.10-2
    • 1.19.11-1
    • 1.19.12-1
    • 1.19.12-2
    • 1.19.12-2~bpo11+1
    • 1.19.12-2~bpo12+1
    • 1.19.13-1
    • 1.19.13-1~bpo11+1
    • 1.19.13-1~bpo12+1
    • 1.19.8-2
    • 1.19.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.24 Debian:13

    Versions
    • 1.24.12-1
    • 1.24.13-1
    • 1.24.13-2
    • 1.24.4-1
    • 1.24.4-2
    • 1.24.4-3
    • 1.24.4-4
    • 1.24.7-1
    • 1.24.8-1
    • 1.24.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.26 Debian:14

    Versions
    • 1.26.0-1
    • 1.26~rc2-1
    • 1.26~rc3-1
    • 1.26~rc3-2
    Affected ranges
    • ECOSYSTEM: < 1.26.1-1

    Update to 1.26.1-1

  • golang-1.24 Ubuntu:22.04:LTS

    Versions
    • 1.24.4-1ubuntu1~22.04.1
    • 1.24.4-1ubuntu1~22.04.2
    • 1.24.13-2~22.04.1
    • 1.24.13-2~22.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.25 Ubuntu:22.04:LTS

    Versions
    • 1.25.14-1~ubuntu0.22.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.26 Ubuntu:22.04:LTS

    Versions
    • 1.26.8-1~ubuntu0.22.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.24 Ubuntu:24.04:LTS

    Versions
    • 1.24.4-1ubuntu1~24.04.1
    • 1.24.4-1ubuntu1~24.04.2
    • 1.24.13-2~24.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.25 Ubuntu:24.04:LTS

    Versions
    • 1.25.14-1~ubuntu0.24.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.26 Ubuntu:24.04:LTS

    Versions
    • 1.26.8-1~ubuntu0.24.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.24 Ubuntu:25.10

    Versions
    • 1.24.2-1
    • 1.24.2-2
    • 1.24.4-1
    • 1.24.4-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.25 Ubuntu:25.10

    Versions
    • 1.25.0-0ubuntu1
    • 1.25.7-2~25.10.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.26 Ubuntu:26.10

    Versions
    • 1.26.0-1
    • 1.26.2-3
    • 1.26.4-1
    • 1.26.5-1
    • 1.26.6-2
    • 1.26.7-1
    • 1.26.8-1
    • 1.26.8-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.24 Ubuntu:26.04:LTS

    Versions
    • 1.24.4-1ubuntu1
    • 1.24.9-1
    • 1.24.13-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.25 Ubuntu:26.04:LTS

    Versions
    • 1.25.0-0ubuntu1
    • 1.25.7-2
    • 1.25.14-1~ubuntu0.26.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.26 Ubuntu:26.04:LTS

    Versions
    • 1.26~rc3-2
    • 1.26.0-1
    • 1.26.8-1~ubuntu0.26.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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