CVE-2026-87794Public exploit

Command execution via mispositioned Info-ZIP separator

Published Sep 9, 2026 · Updated Sep 9, 2026

Argument injection in bestzip 2.2.6 and 3.0.2 allows local users to execute commands through the native Info-ZIP backend. The nativeZip function places an attacker-controlled destination before the -- separator, letting -n consume it and exposing crafted source entries such as -T and -TT to Info-ZIP option parsing. Exploitation requires an application to pass attacker-controlled destination and source values while a native Info-ZIP zip binary is available, and commands run with Node.js process privileges.

CVSS severity8.6
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Argument injection in bestzip 2.2.6 and 3.0.2 allows local users to execute commands through the native Info-ZIP backend. The nativeZip function places an attacker-controlled destination before the -- separator, letting -n consume it and exposing crafted source entries such as -T and -TT to Info-ZIP option parsing. Exploitation requires an application to pass attacker-controlled destination and source values while a native Info-ZIP zip binary is available, and commands run with Node.js process privileges.

The record

CVE
CVE-2026-87794
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
Nathan Friedly
Product
bestzip
Classifications
CWE-88, T1059
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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=2.2.6 <2.2.7
  2. Affected versionversion=3.0.2 <3.0.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Nathan Friedly · bestzipversion=2.2.6 <2.2.7; version=3.0.2 <3.0.3

Published CVSS scores

8.6VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.4nfriedlyCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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