Description
A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libssh2 | 1.11.0, 1.11.1 | — |
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 | 1.11.1-3 | — |
| Debian 13 | libssh2 | 1.11.1-1+deb13u1 | — |
| Debian 12 | libssh2 | 1.10.0-3+deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libssh2 | 1.11.1-1ubuntu0.26.04.1 | — |
| Ubuntu 25.10 | libssh2 | 1.11.1-1ubuntu0.25.10.1 | — |
| Ubuntu 24.04 LTS | libssh2 | 1.11.0-4.1ubuntu0.24.04.1 | — |
| Ubuntu 22.04 LTS | libssh2 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libssh2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libssh2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libssh2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libssh2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 ELS | libssh2 +1 | 1.8.0-4.el7_9.2 | RHSA-2026:61752 |
| Red Hat Hardened Images 1 | libssh2 +2 | 1.11.1-5.1.hum1 | RHSA-2026:7021 |
| Red Hat Hardened Images 1 | rust +16 | 1.95.0-5.hum1 | RHSA-2026:16736 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libssh2_org | 1.11.0-150600.20.6.1 | SUSE-SU-2026:3541-1 |
| SLES 15 SP6 | libssh2_org | 1.11.0-150600.20.6.1 | SUSE-SU-2026:3541-1 |
| SLES 15 SP5 | libssh2_org | 1.11.0-150200.9.8.1 | SUSE-SU-2026:3526-1 |
| SLES 15 SP4 | libssh2_org | 1.11.0-150000.4.35.1 | SUSE-SU-2026:4095-1, SUSE-SU-2026:3526-1 |
| SLES 12 SP5 | libssh2_org | 1.11.0-29.18.1 | SUSE-SU-2026:3525-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | libssh2_org | 1.11.1-160000.5.1 | SUSE-SU-2026:23225-1, SUSE-SU-2026:23214-1 |
| SLES for SAP 15 SP6 | libssh2_org | 1.11.0-150600.20.6.1 | SUSE-SU-2026:3541-1 |
| SLES for SAP 15 SP5 | libssh2_org | 1.11.0-150200.9.8.1 | SUSE-SU-2026:3526-1 |
| SLES for SAP 15 SP4 | libssh2_org | 1.11.0-150200.9.8.1 | SUSE-SU-2026:3526-1 |
| SLES 16.0 | libssh2_org | 1.11.1-160000.5.1 | SUSE-SU-2026:23225-1, SUSE-SU-2026:23214-1 |
| SLE Micro 6.2 | libssh2_org | 1.11.1-160000.5.1 | SUSE-SU-2026:23049-1 |
| SLE Micro 6.1 | libssh2_org | 1.11.0-slfo.1.1_2.1 | SUSE-SU-2026:23187-1 |
| SLE Micro 6.0 | libssh2_org | 1.11.0-4.1 | SUSE-SU-2026:23245-1 |
| SLE Micro 5.5 | libssh2_org | 1.11.0-150200.9.8.1 | SUSE-SU-2026:3526-1 |
| SLE Micro 5.4 | libssh2_org | 1.11.0-150200.9.8.1 | SUSE-SU-2026:3526-1 |
| SLE Micro 5.3 | libssh2_org | 1.11.0-150200.9.8.1 | SUSE-SU-2026:3526-1 |
| SLE HPC 15 SP5 | libssh2_org | 1.11.0-150200.9.8.1 | SUSE-SU-2026:3526-1 |
| SLE HPC 15 SP4 | libssh2_org | 1.11.0-150000.4.35.1 | SUSE-SU-2026:4095-1, SUSE-SU-2026:3526-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libssh2_org | 1.11.1-3.1 | openSUSE-SU-2026:11109-1 |
| openSUSE Leap 16.0 | libssh2_org | 1.11.1-160000.5.1 | openSUSE-SU-2026:21549-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libssh2 | 1.11.1-r2 | — |
| Alpine v3.23 | libssh2 | 1.11.1-r2 | — |
| Alpine v3.22 | libssh2 | 1.11.1-r1 | — |
| Alpine v3.21 | libssh2 | 1.11.1-r1 | — |
| Alpine v3.20 | libssh2 | 1.11.0-r3 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | cargo-c | 0.10.19-1.amzn2023.0.3 | ALAS2023-2026-1872 |
| Amazon Linux 2023 | libssh2 +2 | 1.10.0-1.amzn2023.0.4 | ALAS2023-2026-1779 |
| Amazon Linux 2 | libssh2 +2 | 1.4.3-12.amzn2.2.7 | ALAS2-2026-3329 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libssh2 | 1.11.1-2 | — |
| Azure Linux 3 | rust | 1.75.0-30 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | libssh2 +2 | 1.11.1-r5 | — |
Advisories 21
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- RHSA-2026:16736 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- RHSA-2026:7021 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- NCSC-2026-0381 Kwetsbaarheden verholpen in Oracle PeopleSoft Enterprise NCSC-NL (Netherlands) · Sep 16, 2026
- WID-SEC-2026-3394 Oracle PeopleSoft: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 15, 2026
- SUSE-SU-2026:4095-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Sep 14, 2026
- WID-SEC-2026-1332 libssh2: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 13, 2026
- RHSA-2026:61752 Red Hat Security Advisory: libssh2 security update Red Hat Security Advisories (RHSA) · Sep 1, 2026
- SUSE-SU-2026:23245-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23225-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23214-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23187-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 26, 2026
- openSUSE-SU-2026:21549-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 12, 2026
- SUSE-SU-2026:23049-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 12, 2026
- SUSE-SU-2026:3541-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 11, 2026
- SUSE-SU-2026:3525-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 8, 2026
- SUSE-SU-2026:3526-1 Security update for libssh2_org SUSE / openSUSE Security Updates · Aug 8, 2026
- openSUSE-SU-2026:11109-1 libssh2-1-1.11.1-3.1 on GA media SUSE / openSUSE Security Updates · Jun 24, 2026
- ALAS2023-2026-1872 Moderate: rust-cargo-c security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 22, 2026
- ALAS2-2026-3329 Moderate: libssh2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 8, 2026
- ALAS2023-2026-1779 Moderate: libssh2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 8, 2026
References
- VDB-360555 | libssh2 userauth.c userauth_password integer overflow vdb-entry technical-description
- VDB-360555 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- Submit #805564 | libssh2 <= 1.11.1 Integer Overflow third-party-advisory
- https://github.com/libssh2/libssh2/pull/1858 issue-tracking patch
- https://github.com/libssh2/libssh2/commit/256d04b60d80bf1190e96b0ad1e91b2174d744b1 patch
- https://github.com/libssh2/libssh2/ product