Hex prints strings supplied by the package repository and the documentation search service straight to the terminal through Hex.Shell.info/1 and Hex.Shell.error/1, neutralizing no control characters. Affected sinks span package metadata and configuration snippets in mix hex.info, search results in mix hex.package search and mix hex.search, owner and organization listings, publish and sponsor URLs, the authenticated username in mix hex.user, policy identities in mix hex.policy, and API error bodies rendered by Hex.Utils.print_error_result/1. A malicious package can embed ANSI escape sequences (cursor movement, line erase, carriage returns, OSC 52 clipboard writes) or Unicode bidirectional overrides in any of those fields, so the bytes reach the terminal unchanged, forging displayed URLs, package descriptions and suggested commands, concealing real output, or writing to the clipboard. No authentication or privileged position is required; only publishing a package.
This issue affects hex: from 0.0.1 before 2.5.2.
Metrics
Affected Vendors & Products
No advisories yet.
Solution
Upgrade Hex to 2.5.2 or later, for example with mix local.hex. Hex then escapes terminal control characters in text from hex.pm and the registry before printing it, and rejects registry dependencies whose package or repository name isn't a valid name.
Workaround
No workaround given by the vendor.
Mon, 12 Oct 2026 16:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in hexpm hex allows a malicious package publisher or a hostile repository server to inject terminal control sequences into the output of Mix tasks. Hex prints strings supplied by the package repository and the documentation search service straight to the terminal through Hex.Shell.info/1 and Hex.Shell.error/1, neutralizing no control characters. Affected sinks span package metadata and configuration snippets in mix hex.info, search results in mix hex.package search and mix hex.search, owner and organization listings, publish and sponsor URLs, the authenticated username in mix hex.user, policy identities in mix hex.policy, and API error bodies rendered by Hex.Utils.print_error_result/1. A malicious package can embed ANSI escape sequences (cursor movement, line erase, carriage returns, OSC 52 clipboard writes) or Unicode bidirectional overrides in any of those fields, so the bytes reach the terminal unchanged, forging displayed URLs, package descriptions and suggested commands, concealing real output, or writing to the clipboard. No authentication or privileged position is required; only publishing a package. This issue affects hex: from 0.0.1 before 2.5.2. | |
| Title | Terminal escape sequence injection in Hex via unneutralized server-supplied output | |
| First Time appeared |
Hexpm
Hexpm hex |
|
| Weaknesses | CWE-150 | |
| CPEs | cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Hexpm
Hexpm hex |
|
| References |
|
|
| Metrics |
cvssV4_0
|
Projects
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Status: PUBLISHED
Assigner: EEF
Published:
Updated: 2026-10-12T15:46:12.146Z
Reserved: 2026-08-31T00:45:02.431Z
Link: CVE-2026-81856
No data.
Status : Received
Published: 2026-10-12T16:17:05.827
Modified: 2026-10-12T16:17:05.827
Link: CVE-2026-81856
No data.
OpenCVE Enrichment
Updated: 2026-10-12T20:15:07Z