---
id: "CVE-2026-56851"
kind: "vulnerability"
aliases: ["CVE-2026-56851", "GO-2026-6629"]
title: "Panic parsing crafted input in x/text/secure/precis in golang.org/x/text"
severity: "high"
cvss: 7.5
epss: 0.00335
exploited: false
status: "open"
category: "package"
products: [{"name": "golang.org/x/text", "fixed": ["0.41.0"], "affected": "< 0.41.0", "ecosystem": "go"}]
ecosystems: ["go"]
tags: ["go", "golang.org/x/text", "package", "services-parsing-user-input"]
not_affected_if: ["does-not-import-secure/precis", "nickname-profile-unused"]
published_at: "2026-10-07T14:09:43+00:00"
first_seen_at: "2026-10-23T19:13:08+00:00"
updated_at: "2026-10-23T19:56:13+00:00"
sources: [{"source": "govuln", "url": "https://pkg.go.dev/vuln/GO-2026-6629", "first_seen_at": "2026-10-23T19:13:08+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-56851", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56851", "first_seen_at": "2026-10-23T19:35:23+00:00"}]
---

# Panic parsing crafted input in x/text/secure/precis in golang.org/x/text

A Go library, golang.org/x/text, panics when its precis (Nickname profile) code transforms crafted input into a short destination buffer, due to an out-of-bounds slice. A remote party who can get such input into a service that uses this code can crash the process, which is a denial of service.

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

## Affected

- go:golang.org/x/text affected < 0.41.0 fixed 0.41.0

## How to check

Run `go list -m golang.org/x/text` in each Go module and check whether the version is below 0.41.0.
Search for imports of golang.org/x/text/secure/precis to see whether the affected code path is used at all.

## Fix

Upgrade golang.org/x/text to 0.41.0 or later with `go get golang.org/x/text@v0.41.0` and rebuild.

## Timeline

- 2026-10-23T19:13:08+00:00 govuln https://pkg.go.dev/vuln/GO-2026-6629
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-56851
- 2026-10-23T19:35:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-56851

## From the sources

The Nickname profile can panic with an out-of-bounds slice error when transforming crafted input into a short destination buffer.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_