CVE-2026-45036Public exploit

Shell command execution via auto-confirmed ZMODEM detection

Published May 15, 2026 · Updated May 15, 2026

OS command injection in Eugeny Tabby before 1.0.233 allows context-dependent attackers to execute shell commands via crafted terminal output. ZModemMiddleware feeds every output chunk to Zmodem.Sentry, unconditionally confirms a detected ZRQINIT header, and writes a fixed ZRINIT response into the active PTY. Execution requires a user to display attacker-controlled bytes while fish, bash, or zsh is active and an attacker-placed executable matches the resulting shell glob; the payload then runs with that user's privileges.

CVSS severity7.0
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Eugeny Tabby before 1.0.233 allows context-dependent attackers to execute shell commands via crafted terminal output. ZModemMiddleware feeds every output chunk to Zmodem.Sentry, unconditionally confirms a detected ZRQINIT header, and writes a fixed ZRINIT response into the active PTY. Execution requires a user to display attacker-controlled bytes while fish, bash, or zsh is active and an attacker-placed executable matches the resulting shell glob; the payload then runs with that user's privileges.

The record

CVE
CVE-2026-45036
Published
May 15, 2026
Updated
May 15, 2026
Vendor
Russh Project
Product
Tabby
Classifications
CWE-78, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2026CVE publishedPublication date reported by the CVE source.
  2. May 15, 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=< 1.0.233

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Russh Project · Tabbyversion=< 1.0.233

Published CVSS scores

7.0GitHub, Inc.CVSS:3.1/AV:L/AC:H/PR:N/UI:R/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-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1204.002Malicious File

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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