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Fencer Vulns
medium 6.1

CVE-2026-27142 json

URLs in meta content attribute actions are not escaped in html/template

published 2026-03-06 8 mo ago modified 2026-09-08 2 mo ago also BIT-golang-2026-27142 , EUVD-2026-10088 , GO-2026-4603

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami golang 1.25.8, 1.26.1
  • go stdlib 1.25.8, 1.26.1
  • Go standard library html/template 1.25.8, 1.26.1
  • golang-1.26 Debian 14 1.26.1-1

debian advisories DEBIAN-CVE-2026-27142

  • golang1.26 hummingbird 1 1.26.2-1.hum1
  • golang1.26-bin hummingbird 1 1.26.2-1.hum1
  • golang1.26-src hummingbird 1 1.26.2-1.hum1
  • golang1.26-misc hummingbird 1 1.26.2-1.hum1
  • golang1.26-tests hummingbird 1 1.26.2-1.hum1
  • golang1.26-shared hummingbird 1 1.26.2-1.hum1
  • golang1.25 hummingbird 1 1.25.8-1.1.hum1
  • golang1.25-bin hummingbird 1 1.25.8-1.1.hum1

red hat advisories RHSA-2026:7291RHSA-2026:5192

  • go1.25-openssl SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 1.25.12-150600.13.21.1
  • go1.25-openssl SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 1.25.12-150000.1.27.1
  • go1.25 SLES for SAP applications 16.0, SLES 16.0 1.25.12-160000.1.1
  • go1.25-openssl SLES for SAP applications 16.0, SLES 16.0 1.25.12-160000.1.1
  • go1.25 SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 1.25.12-150000.1.44.1
  • go1.25 SLES for SAP applications 16.0, SLES 16.0 1.25.8-160000.1.1
  • go1.26-openssl SLES for SAP applications 16.0, SLES 16.0 1.26.1-160000.1.1
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260317T205859-150000.1.152.1

suse advisories SUSE-SU-2026:3151-1SUSE-SU-2026:3046-1SUSE-SU-2026:22643-1SUSE-SU-2026:22638-1SUSE-SU-2026:2817-1SUSE-SU-2026:21200-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • go1.25 openSUSE Leap 16.0 1.25.12-160000.1.1
  • go1.25-openssl openSUSE Leap 16.0 1.25.12-160000.1.1
  • go1.25 openSUSE Leap 16.0 1.25.8-160000.1.1
  • go1.26-openssl openSUSE Leap 16.0 1.26.1-160000.1.1
  • go1.26 openSUSE Leap 16.0 1.26.1-160000.1.1
  • go1.25 openSUSE Tumbleweed 1.25.8-1.1
  • go1.26 openSUSE Tumbleweed 1.26.1-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21324-1openSUSE-SU-2026:21319-1openSUSE-SU-2026:20496-1openSUSE-SU-2026:20537-1openSUSE-SU-2026:20342-1

  • go Alpine 3.24, Alpine 3.23 1.25.8-r0
  • rclone Alpine 3.24 1.73.5-r0

alpine advisories ALPINE-CVE-2026-27142

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-27142 updated cvss 5.4

html/template: URLs in meta content attribute actions are not escaped in html/template

  • Red Hat OpenShift Service Mesh 2 openshift-service-mesh/openshift-golang-builder Red Hat OpenShift Service Mesh 3 openshift-service-mesh/openshift-golang-builder Red Hat Enterprise Linux 8 golang, go-toolset, golang-bin, golang-src, golang-misc, golang-race, +1 more Red Hat Enterprise Linux 9 golang, go-toolset, golang-bin, golang-src, golang-misc, golang-race, +1 more Red Hat Enterprise Linux 10 golang Red Hat Enterprise Linux AI (RHEL AI) 3 golang
    +2 more products
    Red Hat OpenShift Container Platform 4 openshift-service-mesh/openshift-golang-builder Red Hat OpenShift Virtualization 4 openshift-service-mesh/openshift-golang-builder
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images golang1.26 1.26.2-1.hum1, golang1.25 1.25.8-1.1.hum1, golang1.26-bin 1.26.2-1.hum1, golang1.26-src 1.26.2-1.hum1, golang1.26-misc 1.26.2-1.hum1, golang1.25-bin 1.25.8-1.1.hum1, +6 more
    fixed: vendor fix RHSA-2026:5192
  • Red Hat OpenShift AI 3.4 rhai/base-image-neuron-rhel9 1793042008
    fixed: vendor fix RHSA-2026:91248
  • Red Hat OpenShift AI 3.5 rhai/base-image-neuron-rhel9 1793042008
    fixed: vendor fix RHSA-2026:91249

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami golang
<1.25.8
>=1.26.0-0, <1.26.1
1.25.8
1.26.1
go stdlib
<1.25.8
>=1.26.0-0, <1.26.1
1.25.8
1.26.1

Affected products

  • Go standard library html/template

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.