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

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.

Published: 2026-03-06 Last update: 2026-04-21 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-27142 is rated Low Risk (27.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.03%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-27142

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-17 0.06% 0.03% -0.03%
2 2026-03-12 0.03% 0.06% +0.03%
3 2026-03-07 — 0.03% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-27142

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-27142

GitHub Security Advisory for CVE-2026-27142

GHSA-j4j7-vw47-rhfq · Severity: high — Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can...

OS Trackers for CVE-2026-27142

vendor priority summary link
alpine — CVE-2026-27142: 1 source package rows (go); 95 state rows across 2 repos (3.23-community, edge-community); fixed 3, open 92. https://security.alpinelinux.org/vuln/CVE-2026-27142
debian not yet assigned CVE-2026-27142 not yet assigned priority: Debian including 5 source packages (golang-1.15, golang-1.19, golang-1.24, golang-1.25, golang-1.26), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 3. https://security-tracker.debian.org/tracker/CVE-2026-27142
redhat medium — https://access.redhat.com/security/cve/CVE-2026-27142
suse medium — https://www.suse.com/security/cve/CVE-2026-27142/
ubuntu medium CVE-2026-27142 medium priority: Ubuntu including 3 source packages (golang-1.24, golang-1.25, golang-1.26), 12 status rows across 4 suites (jammy, noble, questing, upstream): DNE 5, needs-triage 5, released 2. https://ubuntu.com/security/CVE-2026-27142

Affected software / configurations for CVE-2026-27142

Vendor Product Version Raw CPE
golang go < 1.25.8 cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
golang go 1.26.0 cpe:2.3:a:golang:go:1.26.0:*:*:*:*:*:*:*

References for CVE-2026-27142

cvelogic Threat Intelligence