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CVE-2026-39826

Escaper bypass leads to XSS in html/template

Published: May 7, 2026Updated: May 13, 2026 Sources: CVE List NVD BDUCWE-116
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.4%
Top 71.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-116

Affected Products

GoThe Go ProjectOSS Libraries
html/templateGo standard library
Library
OSS Libraries / go
gogolangOSS Libraries
the go projectoss-projectOSS Librariesaka go, golang-google-protobuf, crypto
go standard libraryoss-projectUSOSS Librariesaka golang standard library, net/http, crypto/x509, html/template
golangoss-projectUSOSS Libraries

Exploitability

Official Patch Available

References

https://go.dev/cl/771180
go.dev
https://go.dev/issue/78981
go.dev
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
groups.google.com
and 1 more references View all →

Timeline

Published
May 7, 2026
Last Updated
May 13, 2026

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