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… (CVE-2026-38755)
A heap overflow vulnerability exists in the evalcommand() function within shell/ash.c of Busybox version 1.38.0. This flaw allows attackers to cause a Denial of Service (DoS) by supplying crafted input to the vulnerable function. The issue is identified as CWE-122 (Heap-based Buffer Overflow) and CWE-674 (Improper Control of a Resource Through a Reference). No known exploits are reported in the wild, and no patch information is currently available.
AI Analysis
Technical Summary
The vulnerability is a heap overflow in the evalcommand() function of Busybox v1.38.0's shell/ash.c component. An attacker can trigger this overflow by providing specially crafted input, leading to a denial of service condition. The vulnerability is categorized under CWE-122 and CWE-674, indicating improper memory handling and resource control. The CVSS 3.1 base score vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability.
Potential Impact
Successful exploitation results in a denial of service by crashing or destabilizing the Busybox shell process due to heap overflow. There is no reported impact on confidentiality or integrity. The availability of the affected service is severely impacted.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should monitor vendor communications for updates. No specific mitigations are provided in the available data.
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… (CVE-2026-38755)
Description
A heap overflow vulnerability exists in the evalcommand() function within shell/ash.c of Busybox version 1.38.0. This flaw allows attackers to cause a Denial of Service (DoS) by supplying crafted input to the vulnerable function. The issue is identified as CWE-122 (Heap-based Buffer Overflow) and CWE-674 (Improper Control of a Resource Through a Reference). No known exploits are reported in the wild, and no patch information is currently available.
CVSS v3.1
Score 7.5high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability is a heap overflow in the evalcommand() function of Busybox v1.38.0's shell/ash.c component. An attacker can trigger this overflow by providing specially crafted input, leading to a denial of service condition. The vulnerability is categorized under CWE-122 and CWE-674, indicating improper memory handling and resource control. The CVSS 3.1 base score vector indicates network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, but high impact on availability.
Potential Impact
Successful exploitation results in a denial of service by crashing or destabilizing the Busybox shell process due to heap overflow. There is no reported impact on confidentiality or integrity. The availability of the affected service is severely impacted.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should monitor vendor communications for updates. No specific mitigations are provided in the available data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-jcqv-rj94-jmx3
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-38755"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a5e79eb2a4a8d59899bb3eb
Added to database: 07/20/2026, 19:41:31 UTC
Last enriched: 07/20/2026, 19:46:39 UTC
Last updated: 07/31/2026, 19:24:50 UTC
Views: 29
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