Medium 6.1Published May 22, 2026

CVE-2026-27136Invoking duplicate attributes can cause XSS in golang.org/x/net/html

Updated under an hour ago (Oct 26, 2026, 11:30 AM ET)

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It affects golang.org/x/net/html and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for golang.org/x/net/html

Exploited in the last 30 days

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

CVSS: 6.1 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Analyzed
Record last updated: May 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

golang.org/x/net golang.org/x/net/html golang.org_x_net:html (from the name)	before 0.55.0	CNA record
golang net golang:net	before 0.55.0	NVD

References

https://go.dev/issue/79575issue-tracking
https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8mailing-list
https://go.dev/cl/781685issue-tracking
https://pkg.go.dev/vuln/GO-2026-5030vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.