A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-1730-1 libssh2 security update
Debian DSA Debian DSA DSA-4431-1 libssh2 security update
EUVD EUVD EUVD-2019-13477 A flaw was found in libssh2 before 1.8.1. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used as an index to copy memory causing in an out of bounds memory write error.
Ubuntu USN Ubuntu USN USN-5308-1 libssh2 vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 19 Dec 2025 03:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in libssh2 before 1.8.1. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used as an index to copy memory causing in an out of bounds memory write error. A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.

Wed, 23 Apr 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2025-12-19T03:02:32.466Z

Reserved: 2019-01-03T00:00:00.000Z

Link: CVE-2019-3863

cve-icon Vulnrichment

Updated: 2024-08-04T19:19:18.614Z

cve-icon NVD

Status : Modified

Published: 2019-03-25T18:29:01.590

Modified: 2025-12-19T04:15:59.683

Link: CVE-2019-3863

cve-icon Redhat

Severity : Important

Publid Date: 2019-03-13T00:00:00Z

Links: CVE-2019-3863 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses