EUVD-2026-53316
GHSA-c6xg-rfqh-85cp
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
PR:L reflects the need for application-level access to supply option values; AV:N is valid when the application exposes backup configuration over a network interface with no additional complexity.
Primary rating from Vendor (309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c).
CVSS VectorVendor: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Lifecycle Timeline
2DescriptionCVE.org
The backmeup npm package assembles shell command strings by directly concatenating its option values (name, source, destination, filter) - e.g. cmd = "mkdir -p " + path.join(info.destination, info.name) + "; " - and executes the resulting string through a shell via ssh2-exec (locally via child_process, or remotely via SSH when an ssh handle is supplied), rather than using execFile/spawn with an argument array. The only processing applied is path.normalize()/path.join(), which do not neutralize shell metacharacters (;, |, &, $(), backticks, newline). Any application that passes attacker-influenced values into these options (e.g. a user-chosen backup name) is vulnerable to arbitrary OS command execution on the backup host, or on the remote SSH target when one is configured.
Articles & Coverage 1
AnalysisAI
OS command injection in the backmeup npm package allows any attacker who can supply input to the package's name, source, destination, or filter options to execute arbitrary shell commands on the backup host or, when SSH mode is configured, on the remote SSH target. The flaw stems from direct string concatenation of option values into shell command strings executed via child_process or ssh2-exec, with no neutralization of metacharacters beyond path.normalize() and path.join(). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the consuming application passes attacker-influenced values into at least one of backmeup's four options: name, source, destination, or filter. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 score of 8.8 with vector AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H is well-grounded in the described mechanics: the attack is network-reachable through whatever interface the consuming application exposes, requires no complex preconditions, demands only low-privilege authenticated access (consistent with a standard application user submitting a backup job), and yields full confidentiality, integrity, and availability impact on the execution host. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch has been identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an immediate inventory of all applications and services using the backmeup npm package across your infrastructure and disable or restrict access to backmeup-dependent backup processes where operationally feasible. …
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Same weakness CWE-78 – OS Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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