--- id: CVE-2019-3856 title: >- An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed summary: >- An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on th… severity: high cvss: 8.8 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H' cwe: - CWE-190 - CWE-787 - CWE-190 - CWE-787 vendor: libssh2 product: libssh2 affected: - libssh2 < 1.8.1 - debian_linux = 8.0 - debian_linux = 9.0 - ontap_select_deploy_administration_utility - leap = 15.0 - leap = 42.3 - enterprise_linux = 8.0 - enterprise_linux_desktop = 7.0 - enterprise_linux_server = 7.0 - enterprise_linux_server_aus = 7.6 - enterprise_linux_server_eus = 7.6 - enterprise_linux_server_tus = 7.6 - enterprise_linux_workstation = 7.0 - fedora = 28 - peoplesoft_enterprise_peopletools = 8.56 - peoplesoft_enterprise_peopletools = 8.57 patched: - libssh2 1.8.1 published: '2019-03-25' updated: '2026-10-14' sourceUpdated: '2026-10-14T07:16:51.650' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-3856' 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: 'https://access.redhat.com/errata/RHSA-2019:0679' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1175' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1652' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1791' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:1943' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2019:2399' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3856' label: secalert@redhat.com - url: 'https://lists.debian.org/debian-lts-announce/2019/03/msg00032.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-2019-3856.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: 'https://access.redhat.com/errata/RHSA-2019:0679' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1175' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1652' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1791' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:1943' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2019:2399' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3856' 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.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-2019-3856.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 tags: - nvd epss: 0.06131 epssPercentile: 0.933 ingestedAt: '2026-10-14T07:21:04.811Z' --- ## Overview An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. ## Affected - `libssh2 < 1.8.1` - `debian_linux = 8.0` - `debian_linux = 9.0` - `ontap_select_deploy_administration_utility` - `leap = 15.0` - `leap = 42.3` - `enterprise_linux = 8.0` - `enterprise_linux_desktop = 7.0` - `enterprise_linux_server = 7.0` - `enterprise_linux_server_aus = 7.6` - `enterprise_linux_server_eus = 7.6` - `enterprise_linux_server_tus = 7.6` - `enterprise_linux_workstation = 7.0` - `fedora = 28` - `peoplesoft_enterprise_peopletools = 8.56` - `peoplesoft_enterprise_peopletools = 8.57` ## Remediation Upgrade past the affected range: - `libssh2 1.8.1`