Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The libssh2 Project | libssh2 | 1.8.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libssh2 | 1.8.0-2.1 | — |
| Debian 13 | libssh2 | 1.8.0-2.1 | — |
| Debian 12 | libssh2 | 1.8.0-2.1 | — |
| Debian 9 | libssh2 | 1.7.0-1+deb9u1 | DSA-4431-1 |
| Debian 8 | libssh2 | 1.4.3-4.1+deb8u2 | DLA-1730-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libssh2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libssh2 | 1.5.0-2ubuntu0.1+esm1 | USN-5308-1 |
| Ubuntu Pro 14.04 LTS | libssh2 | 1.4.3-2ubuntu0.2+esm2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | SLOF | 20171214-5.gitfa98132.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | hivex +4 | 1.3.15-6.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | libguestfs-winsupport | 8.0-2.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | libiscsi +2 | 1.18.0-6.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | libssh2 | 1.8.0-7.module+el8.0.0+3075+09be6b65.1 | RHSA-2019:1175 |
| RHEL 8 | libvirt +27 | 4.5.0-23.1.module+el8.0.0+3151+3ba813f9 | RHSA-2019:1175 |
| RHEL 8 | libvirt-dbus | 1.2.0-2.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | libvirt-python +1 | 4.5.0-1.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | nbdkit +9 | 1.4.2-4.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | netcf +2 | 0.2.8-10.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | perl-Sys-Virt | 4.5.0-4.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | qemu-img +9 | 15:2.12.0-64.module+el8.0.0+3180+d6a3561d.2 | RHSA-2019:1175 |
| RHEL 8 | seabios +2 | 1.11.1-3.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | sgabios +1 | 1:0.20170427git-2.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | supermin +1 | 5.1.19-8.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 8 | virt-dib +24 | 1:1.38.4-10.module+el8.0.0+3075+09be6b65 | RHSA-2019:1175 |
| RHEL 7 | libssh2 +2 | 1.4.3-12.el7_6.2 | RHSA-2019:0679 |
| RHEL 6 | libssh2 +2 | 1.4.2-3.el6_10.1 | RHSA-2019:1652 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.5 EUS | libssh2 +2 | 1.4.3-11.el7_5.1 | RHSA-2019:1791 |
| RHEL 7.4 EUS | libssh2 +2 | 1.4.3-11.el7_4.1 | RHSA-2019:1943 |
| RHEL 7.3 TUS | libssh2 +2 | 1.4.3-11.el7_3.1 | RHSA-2019:2399 |
| RHEL 7.3 E4S | libssh2 +2 | 1.4.3-11.el7_3.1 | RHSA-2019:2399 |
| RHEL 7.3 AUS | libssh2 +2 | 1.4.3-11.el7_3.1 | RHSA-2019:2399 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | libssh2_org | 1.9.0-4.13.1 | SUSE-SU-2020:3551-1 |
| SLES 15 SP1 | libssh2_org | 1.9.0-4.13.1 | SUSE-SU-2020:3551-1 |
| SLES 15 | libssh2_org | 1.9.0-4.13.1 | SUSE-SU-2020:3551-1 |
| SLES 12 SP4 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES 12 SP3 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES 12 SP1 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES 12 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES 11 SP4 | libssh2_org | 1.4.3-17.3.1 | SUSE-SU-2019:13982-1 |
| SLES for SAP 15 | libssh2_org | 1.9.0-4.13.1 | SUSE-SU-2020:3551-1 |
| SLES for SAP 12 SP4 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES for SAP 12 SP3 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES for SAP 12 SP2 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES for SAP 12 SP1 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SLES for SAP 11 SP4 | libssh2_org | 1.4.3-17.3.1 | SUSE-SU-2019:13982-1 |
| SLE HPC 15 | libssh2_org | 1.9.0-4.13.1 | SUSE-SU-2020:3551-1 |
| SUSE OpenStack Cloud 7 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | libssh2_org | 1.2.9-4.2.12.5.1 | SUSE-SU-2019:13997-1 |
| SUSE Enterprise Storage 4 | libssh2_org | 1.4.3-20.3.1 | SUSE-SU-2019:0655-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libssh2_org | 1.9.0-3.6 | openSUSE-SU-2024:10999-1 |
| openSUSE Leap 15.2 | libssh2_org | 1.9.0-lp152.8.3.1 | openSUSE-SU-2020:2129-1 |
| openSUSE Leap 15.1 | libssh2_org | 1.9.0-lp151.6.6.1 | openSUSE-SU-2020:2126-1 |
| openSUSE Leap 15.0 | libssh2_org | 1.8.0-lp150.3.3.1 | openSUSE-SU-2019:1109-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.23 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.22 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.21 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.20 | libssh2 | 1.8.1-r0 | — |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.18 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.17 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.16 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.15 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.14 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.13 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.12 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.11 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.10 | libssh2 | 1.8.1-r0 | — |
| Alpine v3.9 | libssh2 | 1.8.1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | libssh2 +2 | 1.4.3-12.amzn2.2 | ALAS2-2019-1199 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | hivex +4 | 1.3.15-6.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | libguestfs-winsupport | 8.0-2.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | libiscsi +2 | 1.18.0-6.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | libssh2 | 1.8.0-7.module+el8.0.0+5219+3c0c6858.1 | ELSA-2019-1175 |
| Oracle Linux 8 | libvirt +27 | 4.5.0-23.1.0.1.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | libvirt-dbus | 1.2.0-2.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | nbdkit +9 | 1.4.2-4.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | netcf +2 | 0.2.8-10.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | perl-Sys-Virt | 4.5.0-4.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | python3-libvirt | 4.5.0-1.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | qemu-img +9 | 15:2.12.0-64.module+el8.0.0+5219+3c0c6858.2 | ELSA-2019-1175 |
| Oracle Linux 8 | seabios +2 | 1.11.1-3.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | sgabios +1 | 1:0.20170427git-2.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | supermin +1 | 5.1.19-8.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 8 | virt-dib +24 | 1:1.38.4-10.0.1.module+el8.0.0+5219+3c0c6858 | ELSA-2019-1175 |
| Oracle Linux 7 | libssh2 +2 | 1.4.3-12.el7_6.2 | ELSA-2019-0679 |
Advisories 23
- RHSA-2019:2399 Red Hat Security Advisory: libssh2 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2019:1943 Red Hat Security Advisory: libssh2 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2019:1791 Red Hat Security Advisory: libssh2 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2019:1652 Red Hat Security Advisory: libssh2 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2019:1175 Red Hat Security Advisory: virt:rhel security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2019:0679 Red Hat Security Advisory: libssh2 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- USN-5308-1 libssh2 vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DSA-4431-1 libssh2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1730-1 libssh2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:13982-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2129-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0655-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3551-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2126-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1109-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:13997-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10999-1 libssh2-1-1.9.0-3.6 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- WID-SEC-2023-1230 libssh2: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 14, 2025
- ELSA-2019-1175 Important: virt:ol security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ALAS2-2019-1199 Important: libssh2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 26, 2019
- ELSA-2019-0679 Important: libssh2 security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 28, 2019
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3863
- https://www.libssh2.org/CVE-2019-3863.html
- [debian-lts-announce] 20190326 [SECURITY] [DLA 1730-1] libssh2 security update mailing-list
- https://security.netapp.com/advisory/ntap-20190327-0005/
- RHSA-2019:0679 vendor-advisory
- openSUSE-SU-2019:1075 vendor-advisory
- openSUSE-SU-2019:1109 vendor-advisory
- FEDORA-2019-3348cb4934 vendor-advisory
- DSA-4431 vendor-advisory
- 20190415 [SECURITY] [DSA 4431-1] libssh2 security update mailing-list
- RHSA-2019:1175 vendor-advisory
- RHSA-2019:1652 vendor-advisory
- RHSA-2019:1791 vendor-advisory
- RHSA-2019:1943 vendor-advisory
- RHSA-2019:2399 vendor-advisory
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html