CVE-2023-3978: Improper rendering of text nodes in golang.org/x/net/html

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-08-02 · updated 2026-06-17
Weakness: CWE-79

Description

Text nodes not in the HTML namespace are incorrectly literally rendered, causing text which should be escaped to not be. This could lead to an XSS attack.

Affected products

Golang Networking: before 0.13.0 — fixed in 0.13.0
Golang.Org/X/Net: before 0.13.0 — fixed in 0.13.0

How to fix

Upgrade to a fixed version: Golang Networking 0.13.0; Golang.Org/X/Net 0.13.0. Check the vendor advisory for mitigations.

References

https://go.dev/cl/514896
https://go.dev/issue/61615
https://pkg.go.dev/vuln/GO-2023-1988
https://go.dev/cl/514896
https://go.dev/issue/61615
https://pkg.go.dev/vuln/GO-2023-1988

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