CVE-2026-93996
Description
A flaw was found in the sshd-scp component of Apache MINA SSHD. The Secure Copy Protocol (SCP) command handler does not enforce an upper limit on incoming command line lengths. An authenticated remote attacker could trigger a Denial of Service (DoS) by sending an unbounded sequence of characters without a line terminator, forcing the application to exhaust available memory and crash.
Statement
This vulnerability is rated as Moderate impact because successful exploitation requires an established, authenticated SSH connection and affects service availability without compromising confidentiality or integrity. In Red Hat products utilizing the Apache MINA SSHD SCP component, an authenticated remote client can transmit an unbounded stream of characters during an SCP transaction, leading to excessive memory allocation and a service crash. Because the flaw cannot be exploited by unauthenticated network attackers and does not permit code execution or privilege escalation, the overall risk to deployed environments remains bounded.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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