---
title: "Detecting malicious Unicode"
url: https://daily.dev/posts/detecting-malicious-unicode-gaq8hapyh
source_url: https://daniel.haxx.se/blog/2025/05/16/detecting-malicious-unicode/
type: article
source: "daniel.haxx.se"
published: 2025-05-16T07:14:42.438Z
updated: 2025-05-16T07:14:57.697Z
tags: ["security", "github", "curl"]
reading_time: 4
upvotes: 10
comments: 0
language: en
---

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# Detecting malicious Unicode

**[daniel.haxx.se](https://daily.dev/sources/danielhaxxse)** · 4 min read · 10 upvotes · 0 comments

## Summary

Curl contributor James Fuller demonstrated how subtle Unicode character replacements went unnoticed in a pull request, prompting concerns about code security. The issue highlighted the difficulty in visually detecting such changes and spurred the implementation of CI checks to validate UTF-8 sequences in the curl repository. While some source code hosting services like Gitea provide warnings for these changes, there remains a need for proactive measures against potential security threats posed by similar Unicode issues.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://daniel.haxx.se/blog/2025/05/16/detecting-malicious-unicode/>

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---

Tags: [#security](https://daily.dev/tags/security), [#github](https://daily.dev/tags/github), [#curl](https://daily.dev/tags/curl)

[View this post on daily.dev](https://daily.dev/posts/detecting-malicious-unicode-gaq8hapyh)