CVE-2026-38638
Received Received - Intake

Denial of Service in relibc with_argv Function

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: MITRE

Description
An issue in the with_argv function (/unistd/mod.rs) of relibc commit 61f42d allows attackers to cause a Denial of Service (DoS) via a crafted input.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-29
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-38638
EUVD
EUVD-2026-67769

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
redox_os relibc *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This vulnerability is a Denial of Service (DoS) issue in the relibc library's with_argv function. It occurs when a program calls execl with an excessive number of arguments, causing a buffer overflow and an out-of-bounds index error. This leads to system crashes or unresponsiveness.

Detection Guidance

To detect this vulnerability, monitor for crashes or unresponsiveness in programs using relibc, particularly when executing with excessive arguments. Check logs for out-of-bounds index errors in the with_argv function.

Impact Analysis

An attacker could exploit this to crash or freeze systems running relibc by passing too many arguments to execl. This could disrupt services, cause data loss, or require system reboots to restore normal operation.

Mitigation Strategies

Update relibc to a patched version if available. Avoid passing excessive arguments to execl in programs. Implement input validation to limit argument counts.

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