Unrated severityNVD Advisory· Published Mar 21, 2019· Updated Dec 17, 2025
CVE-2019-3855
CVE-2019-3855
Description
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
32- osv-coords30 versionspkg:rpm/opensuse/libssh2_org&distro=openSUSE%20Leap%2015.0pkg:rpm/opensuse/libssh2_org&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/libssh2_org&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/libssh2_org&distro=openSUSE%20Tumbleweedpkg:rpm/suse/libssh2_org&distro=SUSE%20Enterprise%20Storage%204pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP3pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP4pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP1pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1-LTSSpkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2012-LTSSpkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2011%20SP4pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP3pkg:rpm/suse/libssh2_org&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP4pkg:rpm/suse/libssh2_org&distro=SUSE%20OpenStack%20Cloud%207
< 1.8.0-lp150.3.3.1+ 29 more
- (no CPE)range: < 1.8.0-lp150.3.3.1
- (no CPE)range: < 1.9.0-lp151.6.6.1
- (no CPE)range: < 1.9.0-lp152.8.3.1
- (no CPE)range: < 1.9.0-3.6
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.9.0-4.13.1
- (no CPE)range: < 1.9.0-4.13.1
- (no CPE)range: < 1.9.0-4.13.1
- (no CPE)range: < 1.9.0-4.13.1
- (no CPE)range: < 1.2.9-4.2.12.5.1
- (no CPE)range: < 1.4.3-17.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.9.0-4.13.1
- (no CPE)range: < 1.4.3-17.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.9.0-4.13.1
- (no CPE)range: < 1.4.3-17.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- (no CPE)range: < 1.4.3-20.3.1
- The libssh2 Project/libssh2v5Range: 1.8.1
Patches
Vulnerability mechanics
References
27- lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.htmlmitrevendor-advisoryx_refsource_SUSE
- lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.htmlmitrevendor-advisoryx_refsource_SUSE
- access.redhat.com/errata/RHSA-2019:0679mitrevendor-advisoryx_refsource_REDHAT
- access.redhat.com/errata/RHSA-2019:1175mitrevendor-advisoryx_refsource_REDHAT
- access.redhat.com/errata/RHSA-2019:1652mitrevendor-advisoryx_refsource_REDHAT
- access.redhat.com/errata/RHSA-2019:1791mitrevendor-advisoryx_refsource_REDHAT
- access.redhat.com/errata/RHSA-2019:1943mitrevendor-advisoryx_refsource_REDHAT
- access.redhat.com/errata/RHSA-2019:2399mitrevendor-advisoryx_refsource_REDHAT
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/mitrevendor-advisoryx_refsource_FEDORA
- www.debian.org/security/2019/dsa-4431mitrevendor-advisoryx_refsource_DEBIAN
- packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.htmlmitrex_refsource_MISC
- seclists.org/fulldisclosure/2019/Sep/42mitremailing-listx_refsource_FULLDISC
- www.openwall.com/lists/oss-security/2019/03/18/3mitremailing-listx_refsource_MLIST
- www.securityfocus.com/bid/107485mitrevdb-entryx_refsource_BID
- bugzilla.redhat.com/show_bug.cgimitrex_refsource_CONFIRM
- lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlmitremailing-listx_refsource_MLIST
- seclists.org/bugtraq/2019/Apr/25mitremailing-listx_refsource_BUGTRAQ
- seclists.org/bugtraq/2019/Mar/25mitremailing-listx_refsource_BUGTRAQ
- seclists.org/bugtraq/2019/Sep/49mitremailing-listx_refsource_BUGTRAQ
- security.netapp.com/advisory/ntap-20190327-0005/mitrex_refsource_CONFIRM
- support.apple.com/kb/HT210609mitrex_refsource_CONFIRM
- www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767mitrex_refsource_CONFIRM
- www.libssh2.org/CVE-2019-3855.htmlmitrex_refsource_MISC
- www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.htmlmitrex_refsource_MISC
News mentions
1- Public PoC Released for Critical libssh2 CVE-2026-55200 Client-Side SSH FlawThe Hacker News · Jun 29, 2026