CVE catalog
CVE-2019-3856
libssh2: CVE-2019-3856
- Severity
- High · CVSS 8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 6.13% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libssh2 | sid | 1.11.1-6 | fixed |
| Debian | libssh2 | forky | 1.11.1-6 | fixed |
| Debian | libssh2 | trixie | 1.11.1-1+deb13u2 | fixed |
| Debian | libssh2 | trixie-security | 1.11.1-1+deb13u1 | fixed |
| Debian | libssh2 | bookworm | 1.10.0-3 | fixed |
| Debian | libssh2 | bookworm-security | 1.10.0-3+deb12u1 | fixed |
| Cpe | libssh2 | Not reported | 1.8.1 | fixed |
| Cpe | debian_linux | Not reported | Not reported | unknown |
| Cpe | ontap_select_deploy_administration_utility | Not reported | Not reported | unknown |
| Cpe | leap | Not reported | Not reported | unknown |
| Cpe | enterprise_linux | Not reported | Not reported | unknown |
| Cpe | enterprise_linux_desktop | Not reported | Not reported | unknown |
| Cpe | enterprise_linux_server | Not reported | Not reported | unknown |
| Cpe | enterprise_linux_server_aus | Not reported | Not reported | unknown |
| Cpe | enterprise_linux_server_eus | Not reported | Not reported | unknown |
| Cpe | enterprise_linux_server_tus | Not reported | Not reported | unknown |
| Cpe | enterprise_linux_workstation | Not reported | Not reported | unknown |
| Cpe | fedora | Not reported | Not reported | unknown |
| Cpe | peoplesoft_enterprise_peopletools | Not reported | Not reported | unknown |
| Ubuntu | libssh2 | pro | 1.8.0-1 | vulnerable |
| Ubuntu | libssh2 | pro | 1.8.0-1ubuntu0.1 | vulnerable |
| Ubuntu | libssh2 | pro | 1.8.0-1ubuntu0.1+esm1 | vulnerable |
| Alpine | libssh2 | 3.10 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.11 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.12 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.13 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.14 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.15 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.16 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.17 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.18 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.19 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.20 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.21 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.22 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.23 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.24 | 1.8.1-r0 | fixed |
| Alpine | libssh2 | 3.9 | 1.8.1-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libssh2 | source | sid | 1.8.0-2.1 | not yet assigned | Not reported | [924965] |
| Debian | libssh2 | source | forky | 1.8.0-2.1 | not yet assigned | Not reported | [924965] |
| Debian | libssh2 | source | trixie | 1.8.0-2.1 | not yet assigned | Not reported | [924965] |
| Debian | libssh2 | source | bookworm | 1.8.0-2.1 | not yet assigned | Not reported | [924965] |
| Cpe | libssh2 | cpe | Not reported | 1.8.1 | Not reported | NVD-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.10 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.11 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.12 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.13 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.14 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.15 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.16 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.17 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.18 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.19 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.20 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.21 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.22 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.23 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.24 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
| Alpine | libssh2 | apk | 3.9 | 1.8.1-r0 | Not reported | ALPINE-CVE-2019-3856 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libssh2-1]Unknown
Source package: [libssh2]
Details (2)
1.10.0-3+b1· amd64 · bookwormFixed · Fixed:
1.8.0-2.1dsa · libssh2 · debian · bookworm
1.10.0-3+b1· arm64 · bookwormFixed · Fixed:
1.8.0-2.1dsa · libssh2 · debian · bookworm
- [libssh2-1-dev]Unknown
Source package: [libssh2]
Details (2)
1.10.0-3+b1· amd64 · bookwormFixed · Fixed:
1.8.0-2.1dsa · libssh2 · debian · bookworm
1.10.0-3+b1· arm64 · bookwormFixed · Fixed:
1.8.0-2.1dsa · libssh2 · debian · bookworm
Observed:
References
- [https://cert-portal.siemens.com/productcert/csaf/ssa-398330.json]
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2019_0679.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2019-3856]
- [https://osv.dev/vulnerability/ALPINE-CVE-2019-3856]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2019-3856]
- [https://security-tracker.debian.org/tracker/CVE-2019-3856]
- [https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-3856.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2019/wid-sec-w-2023-1230.json]
[CERT-Bund public advisories] · [CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]