CVE-2026-55601— MultiTail: Shell injection in execute-on-match command handling
Quick assessment
Affected
folkertvanheusden multitail
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.
MultiTail 是一个用于在单个终端中监控多个日志文件的实用工具。在 7.1.5 及更早版本中， 和 的“匹配时执行”功能会将攻击者可控的匹配输入追加到配置的命令中，并用双引号括起来，随后 中的 函数会将该构造的命令通过 中的 传递给 。由于部分转义处理存在缺陷，导致诸如命令替换等 shell 元字符仍然保持活跃状态，因此，如果攻击者能够影响被监控的日志输入内容，就可以以运行 MultiTail 的用户身份执行任意命令。截至本次审查，尚无官方修复版本发布。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1203 · Exploitation for Client ExecutionAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| folkertvanheusden | multitail | <= 7.1.5 |
affected |
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I. Basic Information for CVE-2026-55601
Vulnerability Information
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Vulnerability Title
MultiTail: Shell injection in execute-on-match command handling
Source: CVE Program / CVE List V5
Vulnerability Description
MultiTail is a utility for monitoring multiple log files in one terminal. In version 7.1.5 and earlier, the -ex and -eX execute-on-match feature appended attacker-controlled matched input to a configured command inside double quotes, then check_filter_exec() in mt.c passed the constructed command through execute_program() in exec.c to sh -c. Partial escaping left shell metacharacters such as command substitution active, allowing an attacker who could influence monitored input to execute commands as the user running MultiTail. No fixed release is available as of this review.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| folkertvanheusden | multitail | <= 7.1.5 | - |
|
II. Public POCs for CVE-2026-55601
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-55601 (1)
Vendor Advisories for CVE-2026-55601 (1)
Security Blog Posts for CVE-2026-55601 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-55601
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