CVE-2026-0966
Publication date 13 February 2026
Last updated 1 April 2026
Ubuntu priority
Description
The API function `ssh_get_hexa()` is vulnerable, when 0-lenght input is provided to this function. This function is used internally in `ssh_get_fingerprint_hash()` and `ssh_print_hexa()` (deprecated), which is vulnerable to the same input (length is provided by the calling application). The function is also used internally in the gssapi code for logging the OIDs received by the server during GSSAPI authentication. This could be triggered remotely, when the server allows GSSAPI authentication and logging verbosity is set at least to SSH_LOG_PACKET (3). This could cause self-DoS of the per-connection daemon process.
Why is this CVE low priority?
Low severity DoS issue
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libssh | 25.10 questing |
Fixed 0.11.2-1ubuntu0.2
|
| 24.04 LTS noble |
Fixed 0.10.6-2ubuntu0.3
|
|
| 22.04 LTS jammy |
Fixed 0.9.6-2ubuntu0.22.04.6
|
|
| 20.04 LTS focal |
Fixed 0.9.3-2ubuntu2.5+esm3
|
|
| 18.04 LTS bionic |
Fixed 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6
|
|
| 16.04 LTS xenial |
Fixed 0.6.3-4.3ubuntu0.6+esm4
|
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Get Ubuntu Pro 30-day free trialSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.5 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | Low |
| Availability impact | Low |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
References
Related Ubuntu Security Notices (USN)
- USN-8051-1
- libssh vulnerabilities
- 18 February 2026
- USN-8051-2
- libssh vulnerabilities
- 23 February 2026