EUVD-2026-44851
GHSA-jcqv-rj94-jmx3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The vulnerable ash interpreter processes locally supplied command input, so AV:L and PR:L are honest; impact is a crash only, giving A:H with C:N/I:N.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4DescriptionCVE.org
A heap overflow in the evalcommand() function (shell/ash.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted input.
AnalysisAI
Denial of service in BusyBox 1.38.0 stems from a heap-based buffer overflow in the evalcommand() routine of the ash shell interpreter (shell/ash.c), where crafted input corrupts heap memory and crashes the process. No public exploit identified at time of analysis, and the EPSS probability is low (0.16%, 6th percentile), indicating no observed exploitation activity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to deliver crafted command input that reaches BusyBox 1.38.0's ash shell so that evalcommand() processes it - i.e., either the ability to invoke ash directly or an application/service that forwards attacker-controlled data into an ash instance. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are mixed and warrant scrutiny. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can supply command input to a BusyBox ash shell - for example through a network-facing service, management interface, or automation hook that forwards user-controlled data to the shell - sends a specially crafted command string that overruns a heap buffer inside evalcommand(). The shell process crashes, denying service; on constrained embedded or container systems this can take down the affected function or device. … |
| Remediation | No vendor-released patched version is identified in the provided data, so a specific fixed release cannot be cited - track the BusyBox mailing list thread (https://lists.busybox.net/pipermail/busybox/2026-June/092354.html) and https://busybox.com for an upstream fix and upgrade to the first release above 1.38.0 that references CVE-2026-38755 once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running BusyBox 1.38.0, documenting network exposure and operational criticality. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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