Description
There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption.
This issue affects only 32-bits builds of libssh.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libssh | < 0.11.2 | 0.11.2 |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
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 | libssh | 0.11.2-1 | — |
| Debian 13 | libssh | 0.11.2-1 | — |
| Debian 12 | libssh | 0.10.6-0+deb12u2 | — |
| Debian 11 | libssh | 0.9.8-0+deb11u2 | DLA-4385-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | libssh | 0.10.6-2ubuntu0.1 | USN-7619-1 |
| Ubuntu 22.04 LTS | libssh | 0.9.6-2ubuntu0.22.04.4 | USN-7619-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | libssh | 0.9.3-2ubuntu2.5+esm1 | USN-7696-1 |
| Ubuntu Pro 18.04 LTS | libssh | 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4 | USN-7696-1 |
| Ubuntu Pro 16.04 LTS | libssh | 0.6.3-4.3ubuntu0.6+esm2 | USN-7696-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | libssh +2 | 0.10.4-18.el9 | RHSA-2026:18683 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libssh +2 | 0.10.4-18.el9 | ALSA-2026:18683 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | libssh | 0.10.4-18.el9 | RLSA-2026:18683 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libssh | 0.9.8-150600.11.3.1 | SUSE-SU-2025:02229-1 |
| SLES 15 SP6 | libssh | 0.9.8-150600.11.3.1 | SUSE-SU-2025:02229-1 |
| SLES 15 SP5 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLES 15 SP4 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLES 15 SP3 | libssh | 0.9.8-150200.13.9.1 | SUSE-SU-2025:02279-1 |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | libssh | 0.6.3-12.15.1 | SUSE-SU-2025:02755-1, SUSE-SU-2025:02281-1 |
| SLES for SAP 15 SP5 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLES for SAP 15 SP4 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLES for SAP 15 SP3 | libssh | 0.9.8-150200.13.9.1 | SUSE-SU-2025:02279-1 |
| SLE Micro 6.1 | libssh | 0.10.6-slfo.1.1_2.1 | SUSE-SU-2025:20596-1 |
| SLE Micro 6.0 | libssh | 0.10.6-2.1 | SUSE-SU-2025:20557-1 |
| SLE Micro 5.5 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLE Micro 5.4 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLE Micro 5.3 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLE Micro 5.2 | libssh | 0.9.8-150200.13.9.1 | SUSE-SU-2025:02279-1 |
| SLE Micro 5.1 | libssh | 0.9.8-150200.13.9.1 | SUSE-SU-2025:02279-1 |
| SLE HPC 15 SP5 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLE HPC 15 SP4 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SLE HPC 15 SP3 | libssh | 0.9.8-150200.13.9.1 | SUSE-SU-2025:02279-1 |
| SUSE Manager Server 4.3 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SUSE Manager Proxy 4.3 | libssh | 0.9.8-150400.3.9.1 | SUSE-SU-2025:02278-1 |
| SUSE Enterprise Storage 7.1 | libssh | 0.9.8-150200.13.9.1 | SUSE-SU-2025:02279-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libssh | 0.11.2-1.1 | openSUSE-SU-2025:15243-1 |
| openSUSE Leap 15.6 | libssh | 0.9.8-150600.11.3.1 | SUSE-SU-2025:02229-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libssh | 0.11.2-r0 | — |
| Alpine v3.23 | libssh | 0.11.2-r0 | — |
| Alpine v3.22 | libssh | 0.11.2-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libssh +2 | 0.10.4-18.el9 | ELSA-2026-18683 |
Advisories 17
- ALSA-2026:18683 Moderate: libssh security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-7696-1 libssh vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- USN-7619-1 libssh vulnerabilities Ubuntu Security Notices (USN) · Oct 27, 2026
- RHSA-2026:18683 Red Hat Security Advisory: libssh security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2025-1423 libssh: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 13, 2026
- WID-SEC-2026-1118 Dell PowerProtect Data Domain OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 5, 2026
- ELSA-2026-18683 Moderate: libssh security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 12, 2026
- RLSA-2026:18683 Moderate: libssh security update Rocky Linux Security Advisories · May 28, 2026
- openSUSE-SU-2025:15243-1 libssh-config-0.11.2-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20596-1 Security update for libssh SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02281-1 Security update for libssh SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20557-1 Security update for libssh SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02279-1 Security update for libssh SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02229-1 Security update for libssh SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02278-1 Security update for libssh SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02755-1 Security update for libssh SUSE / openSUSE Security Updates · Feb 4, 2026
- DLA-4385-1 libssh - security update Debian Security (DSA / DLA) · Nov 27, 2025