EUVD-2026-44850
GHSA-jj7c-h3wm-vjfw
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Reaching ash's field-splitting requires supplying input to a shell the attacker can invoke, implying local access at low privilege (AV:L/PR:L); impact is a crash, so availability-only (A:H).
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 ifsbreakup() 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 lets attackers crash the bundled ash shell by supplying crafted input that triggers a heap-based buffer overflow (CWE-122) in the ifsbreakup() field-splitting routine of shell/ash.c. Only availability is impacted - there is no public exploit identified at time of analysis, and the EPSS score is low (0.16%, 6th percentile), indicating little observed exploitation interest so far. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Triggering requires attacker-controlled input to reach BusyBox 1.38.0's ash shell field-splitting path (ifsbreakup() in shell/ash.c) - i.e., data that undergoes IFS-based word splitting during shell expansion. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are mixed and lean toward lower real-world priority than the 7.5 CVSS suggests. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can supply input to a BusyBox ash shell - for example a script or command line whose field-splitting operates on attacker-influenced data - provides a crafted string that overflows the heap buffer in ifsbreakup(), corrupting memory and crashing the shell. In a deployment where an exposed service passes untrusted input into an ash script, this could translate into a repeatable denial of service against that component. … |
| Remediation | No vendor-released patched version is independently confirmed from the available data - the BusyBox mailing-list reference (https://lists.busybox.net/pipermail/busybox/2026-June/092353.html) appears to be a discussion/report thread rather than a tagged release, so track the BusyBox project (https://busybox.com) and upstream git for a fixed 1.38.x build and upgrade once published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running BusyBox 1.38.0 in your environment and classify them by criticality; implement input validation and restrict shell access to authenticated users only. …
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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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