CVE-2026-81856Network attack vectorHinoki check available

Output forgery via unescaped terminal control sequences

Published Oct 12, 2026 · Updated Oct 12, 2026

Terminal injection in Hex.pm Hex before 2.5.2 allows remote attackers to forge Mix task output via malicious package metadata. Hex.Shell.info/1 and Hex.Shell.error/1 print repository and documentation-search strings without neutralizing terminal controls or bidirectional overrides. A developer must run an affected task that displays hostile content in an interpreting terminal; the resulting effects include concealed output, forged URLs or commands, and clipboard writes where supported.

CVSS severity2.3
Low
EPSS probability0.37%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Terminal injection in Hex.pm Hex before 2.5.2 allows remote attackers to forge Mix task output via malicious package metadata. Hex.Shell.info/1 and Hex.Shell.error/1 print repository and documentation-search strings without neutralizing terminal controls or bidirectional overrides. A developer must run an affected task that displays hostile content in an interpreting terminal; the resulting effects include concealed output, forged URLs or commands, and clipboard writes where supported.

The record

CVE
CVE-2026-81856
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
Hex.pm
Product
Hex
Classifications
CWE-150, CAPEC-93
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.0.1 <2.5.2
  2. Affected versionversion=211303e3f68f5d3ce06450c1ff1a7a770a9ab236 <dd3305ddf0032f6d0b468fd40dbbc3072bfcb8b8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hex.pm · Hexversion=0.0.1 <2.5.2; version=211303e3f68f5d3ce06450c1ff1a7a770a9ab236 <dd3305ddf0032f6d0b468fd40dbbc3072bfcb8b8

Published CVSS scores

2.3EEFCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-150Improper Neutralization of Escape, Meta, or Control Sequences
CAPEC-93Log Injection-Tampering-Forging

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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