CVE-2026-15370

Analyzed Analyzed - Analysis Complete

libssh SFTP Longname Stack Buffer Overflow

Publication date: 2026-07-21

Last updated on: 2026-09-22

Assigner: redhat-SADP

Description

A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-21

Last Modified

2026-09-22

Generated

2026-10-10

AI Q&A

2026-07-21

EPSS Evaluated

2026-10-09

NVD

CVE-2026-15370

EUVD

EUVD-2026-46169

Affected Vendors & Products

Vendor	Product	Version / Range
redhat	enterprise_linux	10.0
redhat	enterprise_linux	10.2
redhat	enterprise_linux_for_els	10.2
redhat	enterprise_linux_for_eus	10.2
redhat	enterprise_linux_for_ibm_z_systems	10.2
redhat	enterprise_linux_for_ibm_z_systems_els	10.2
redhat	enterprise_linux_for_ibm_z_systems_eus	10.2
redhat	enterprise_linux_for_power_little_endian	10.0
redhat	enterprise_linux_for_power_little_endian	10.2
redhat	enterprise_linux	10.0
redhat	enterprise_linux	10.2
redhat	enterprise_linux_for_els	10.2
redhat	enterprise_linux_for_eus	10.2
redhat	enterprise_linux_for_power_little_endian_els	10.2
redhat	enterprise_linux_for_power_little_endian_eus	10.2
redhat	enterprise_linux_for_ibm_z_systems	10.0
redhat	enterprise_linux	10.0
redhat	hardened_images	*
libssh	libssh	0.12.0
libssh	libssh	From 0.11.0 (inc) to 0.11.5 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This vulnerability is a stack-based buffer overflow in libssh's SFTP server directory listing. When an attacker provides a very long filename in a directory, the server's longname field overflows a fixed-size stack buffer during processing. This can crash the server or potentially allow code execution.

Detection Guidance

To detect this vulnerability, monitor for crashes in libssh-based SFTP servers during directory listings. Check logs for segmentation faults or unusual activity in SSH processes. No specific commands are provided in the context.

Impact Analysis

If you run a libssh-based SFTP server, an attacker could exploit this to crash your server or execute malicious code. This could lead to service disruption or unauthorized access to your system. The impact depends on server configuration and privileges.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR's integrity and confidentiality requirements or HIPAA's security rules for protected health information. Organizations must patch to maintain compliance.

Mitigation Strategies

Apply the latest patches for libssh to fix the stack buffer overflow in SFTP directory listing. If patches are unavailable, restrict access to SFTP services or disable them until patched. Monitor vendor advisories for updates.

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