gchq/CyberChef

bug(Decode Text): Uncaught Error "Unrecognized CP: undefined"

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#2,494 opened on Jun 4, 2026

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 (0 comments) (0 reactions) (0 assignees)JavaScript (34,843 stars) (3,944 forks)batch import
buggood first issuehelp wanted

Description

To reproduce that use a direct link https://gchq.github.io/CyberChef/#recipe=Decode_text('')&oenc=65001&oeol=VT then as you can see an uncaught error

Decode text - Error in https://gchq.github.io/CyberChef/modules/Encodings.js on line 2.<br><br>Message: Unrecognized CP: undefined

the issue is simple and persists the parameter not validated is have a value or not, it happend with both Encode Text and Decode Text

Contributor guide

Tech stack
javascript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
None
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
85
Research direction
Add validation for the codepage parameter in the Decode Text and Encode Text operations to prevent the 'Unrecognized CP: undefined' error.