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CVE-2026-81856— Terminal escape sequence injection in Hex via unneutralized server-supplied output

Quick assessment

Affected
hexpm hex
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是对该漏洞描述信息的中文翻译： 漏洞标题：hexpm hex 中存在不当处理转义、元字符或控制序列的漏洞 在 hexpm hex 中，存在因不当处理转义序列、元字符或控制序列而导致的安全漏洞。恶意包发布者或敌对仓库服务器可利用此漏洞，向 Mix 命令的输出中注入终端控制序列。 Hex 通过 和 将包仓库和文档搜索服务提供的字符串直接输出到终端，且未对任何控制字符进行转义或过滤。受影响的输出点包括： 中的包元数据和配置片段； 和 中的搜索结果； 所有者和组织列表； 发布和赞助 URL； 中显示的已认证用户名； 中

CVSS 2.3 · Low EPSS 0.37% · P29

Affected Version Matrix 2

VendorProduct Version RangeStatus
hexpm hex 0.0.1< 2.5.2 affected
211303e3f68f5d3ce06450c1ff1a7a770a9ab236< dd3305ddf0032f6d0b468fd40dbbc3072bfcb8b8 affected
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I. Basic Information for CVE-2026-81856

Vulnerability Information
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Vulnerability Title
Terminal escape sequence injection in Hex via unneutralized server-supplied output
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
转义、元或控制序列转义处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hexpm hex 0.0.1 ~ 2.5.2 cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*
hexpm hex 211303e3f68f5d3ce06450c1ff1a7a770a9ab236 ~ dd3305ddf0032f6d0b468fd40dbbc3072bfcb8b8 cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-81856

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III. Intelligence Information for CVE-2026-81856

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Vendor Advisories for CVE-2026-81856 (3)

Same Patch Batch · hexpm · 2026-10-12 · 7 CVEs total

CVE-2026-96612 7.5 HIGH Path traversal in Hex via unvalidated dependency app names
CVE-2026-105668 7.1 HIGH Hex release-age cooldown is lifted package-wide when the locked release is retired
CVE-2026-105280 6.9 MEDIUM Hex writes unverified package tarballs to standard output in mix hex.package fetch
CVE-2026-103502 5.9 MEDIUM hex_core's default HTTP adapter doesn't verify TLS certificates on OTP 24 and 25
CVE-2026-103503 5.9 MEDIUM Hex trusts its bundled CA certificates when cacerts_path is set
CVE-2026-96618 2.1 LOW Hex exhausts memory and disk on oversized or compressed responses from an untrusted mirror

IV. Related Vulnerabilities

Same product: hex
Same vendor: hexpm
Same weakness: CWE-150

V. Comments for CVE-2026-81856

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