CVE-2026-73055Public exploitNetwork attack vector

Home-directory disclosure via unescaped BusyBox tilde

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper escaping in Shescape before 2.1.15 and 3.0.0 through 3.0.1 allows attackers to disclose a home-directory path via a tilde payload. The BusyBox getEscapeFunction in src/internal/unix/busybox.js recognizes tildes only at line starts or after whitespace, so escape and escapeAll leave a tilde expandable after a colon or equals sign. Exploitation requires untrusted input in an assignment prefixed to a command, an explicitly selected sh shell, and /bin/sh resolving to BusyBox; expansion can redirect the command's operating location.

CVSS severity9.3
Critical
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper escaping in Shescape before 2.1.15 and 3.0.0 through 3.0.1 allows attackers to disclose a home-directory path via a tilde payload. The BusyBox getEscapeFunction in src/internal/unix/busybox.js recognizes tildes only at line starts or after whitespace, so escape and escapeAll leave a tilde expandable after a colon or equals sign. Exploitation requires untrusted input in an assignment prefixed to a command, an explicitly selected sh shell, and /bin/sh resolving to BusyBox; expansion can redirect the command's operating location.

The record

CVE
CVE-2026-73055
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
Eric Cornelissen
Product
Shescape
Classifications
CWE-200, CWE-116, T1083
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 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=0 <2.1.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Eric Cornelissen · Shescapeversion=0 <2.1.15

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
4.8VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-116Improper Encoding or Escaping of Output
T1083File and Directory Discovery

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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