---
id: "CVE-2026-97030"
kind: "vulnerability"
aliases: ["CVE-2026-97030", "GO-2026-6600"]
title: "Recognize yield as regexp preceder keyword in html/template"
severity: "medium"
cvss: 6.1
epss: 0.00202
exploited: false
status: "open"
category: "package"
products: [{"name": "stdlib", "fixed": ["1.26.9", "1.27.2"], "affected": ">= 1.27.0-0, < 1.27.2", "ecosystem": "go"}]
ecosystems: ["go"]
tags: ["go", "html/template", "package", "web-apps"]
not_affected_if: ["no-html-template-use", "static-export"]
published_at: "2026-10-08T22:31:09+00:00"
first_seen_at: "2026-10-23T19:13:08+00:00"
updated_at: "2026-10-23T19:57:56+00:00"
sources: [{"source": "govuln", "url": "https://pkg.go.dev/vuln/GO-2026-6600", "first_seen_at": "2026-10-23T19:13:08+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-97030", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97030", "first_seen_at": "2026-10-23T19:35:23+00:00"}]
---

# Recognize yield as regexp preceder keyword in html/template

Go's html/template standard library package did not treat the 'yield' keyword as a regexp-preceding keyword, so some template output could be escaped incorrectly. The sources describe this as requiring a trusted template author, so an attacker mainly gains a possible escaping bypass in templates that are already trusted.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- go:stdlib affected >= 1.27.0-0, < 1.27.2 fixed 1.26.9, 1.27.2

## How to check

Run 'go version' and check that the go.mod go directive and the toolchain in use are not in the affected range (>= 1.27.0-0, < 1.27.2 or < 1.26.9 on the 1.26 line).
Run 'go list -m all' or 'govulncheck ./...' to see whether the stdlib module is used by your build.

## Fix

Upgrade the Go toolchain to 1.26.9 or 1.27.2 and rebuild.

## Timeline

- 2026-10-23T19:13:08+00:00 govuln https://pkg.go.dev/vuln/GO-2026-6600
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-97030
- 2026-10-23T19:35:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-97030

## From the sources

A trusted template author may have previously written a valid template wherein the use of the 'yield' keyword would not be correctly escaped.

We now ensure that valid keyword uses are escaped and non-keyword uses are not escaped.

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