Vulnerability · Published Jul 22, 2025 · Assigned by redhat
CVE-2025-4878Libssh: use of uninitialized variable in privatekey_from_file()
Low 3.6
In plain English
A low-severity use-after-free in libssh. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.6Low
Exploit odds (30 days)0.2%top 86.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A vulnerability was found in libssh, where an uninitialized variable exists under certain conditions in the privatekey_from_file() function. This flaw can be triggered if the file specified by the filename doesn't exist and may lead to possible signing failures or heap corruption.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:9 | libssh | 0.10.4-18.el9 | ALSA-2026:18683 |
| AlmaLinux:9 | libssh-config | 0.10.4-18.el9 | ALSA-2026:18683 |
| AlmaLinux:9 | libssh-devel | 0.10.4-18.el9 | ALSA-2026:18683 |
| Alpine:v3.22 | libssh | 0.11.2-r0 | ALPINE-CVE-2025-4878 |
| Alpine:v3.23 | libssh | 0.11.2-r0 | ALPINE-CVE-2025-4878 |
| Alpine:v3.24 | libssh | 0.11.2-r0 | ALPINE-CVE-2025-4878 |
| Debian:12 | libssh | 0.10.6-0+deb12u2 | DEBIAN-CVE-2025-4878 |
| Debian:13 | libssh | 0.11.2-1 | DEBIAN-CVE-2025-4878 |
| Debian:14 | libssh | 0.11.2-1 | DEBIAN-CVE-2025-4878 |
| Rocky Linux:9 | libssh | 0:0.10.4-18.el9 | RLSA-2026:18683 |
| Ubuntu:22.04:LTS | libssh | 0.9.6-2ubuntu0.22.04.4 | USN-7619-1 |
| Ubuntu:22.04:LTS | libssh | 0.9.6-2ubuntu0.22.04.4 | UBUNTU-CVE-2025-4878 |
| Ubuntu:24.04:LTS | libssh | 0.10.6-2ubuntu0.1 | UBUNTU-CVE-2025-4878 |
| Ubuntu:24.04:LTS | libssh | 0.10.6-2ubuntu0.1 | USN-7619-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| libssh | 0 – before 0.11.2 | |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
References
- RHSA-2026:18683 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2025-4878 vdb-entry, x_refsource_REDHAT
- RHBZ#2376184 issue-tracking, x_refsource_REDHAT
- https://git.libssh.org/projects/libssh.git/commit/?id=697650caa97eaf7623924c75f9fcfec6dd423cd1
- https://git.libssh.org/projects/libssh.git/commit/?id=b35ee876adc92a208d47194772e99f9c71e0bedb
- https://www.libssh.org/security/advisories/CVE-2025-4878.txt