---
id: CVE-2019-3860
title: >-
  An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way
  SFTP packets with empty payloads are parsed
summary: >-
  An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way
  SFTP packets with empty payloads are parsed. A remote attacker who compromises
  a SSH server may be able to cause a Denial of Service or read data in the
  client …
severity: medium
cvss: 5
cvssVector: 'CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L'
cwe:
  - CWE-125
vendor: libssh2
product: libssh2
affected:
  - 'libssh2 >= 0.3, <= 1.8.0'
  - debian_linux = 8.0
  - ontap_select_deploy_administration_utility
  - leap = 15.0
  - leap = 42.3
published: '2019-03-25'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T07:16:52.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-3860'
references:
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html'
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00072.html'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3860'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html'
    label: secalert@redhat.com
  - url: 'https://lists.debian.org/debian-lts-announce/2019/07/msg00028.html'
    label: secalert@redhat.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
    label: secalert@redhat.com
  - url: 'https://seclists.org/bugtraq/2019/Apr/25'
    label: secalert@redhat.com
  - url: 'https://security.netapp.com/advisory/ntap-20190327-0005/'
    label: secalert@redhat.com
  - url: 'https://www.debian.org/security/2019/dsa-4431'
    label: secalert@redhat.com
  - url: 'https://www.libssh2.org/CVE-2019-3860.html'
    label: secalert@redhat.com
  - url: >-
      https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
    label: secalert@redhat.com
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00072.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3860'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2019/03/msg00032.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2019/07/msg00028.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://seclists.org/bugtraq/2019/Apr/25'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20190327-0005/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2019/dsa-4431'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.libssh2.org/CVE-2019-3860.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-3860.json
  - url: 'https://access.redhat.com/security/cve/CVE-2019-3860'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1687310'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2019-3860'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2019-3860'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.05118
epssPercentile: 0.92208
ingestedAt: '2026-10-14T07:21:04.812Z'
---

## Overview

An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SFTP packets with empty payloads are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

## Affected

- `libssh2 >= 0.3, <= 1.8.0`
- `debian_linux = 8.0`
- `ontap_select_deploy_administration_utility`
- `leap = 15.0`
- `leap = 42.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Virtualization 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Virtualization 4 · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-3860.json)