CVE-2026-0966— Libssh: buffer underflow in ssh_get_hexa() on invalid input
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I. Basic Information for CVE-2026-0966
Vulnerability Information
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Vulnerability Title
Libssh: buffer underflow in ssh_get_hexa() on invalid input
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
缓冲区下溢
Source: NVD (National Vulnerability Database)
Vulnerability Title
libssh 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libssh是libssh组织的一个用于访问SSH服务的C语言开发包，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh存在安全漏洞，该漏洞源于ssh_get_hexa函数在无效输入时存在缓冲区下溢。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Hardened Images | 0.12.0-1.1.hum1 ~ * | cpe:/a:redhat:hummingbird:1 | |
| Red Hat | Red Hat Enterprise Linux 10 | - | cpe:/o:redhat:enterprise_linux:10 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat Enterprise Linux 7 | - | cpe:/o:redhat:enterprise_linux:7 | |
| Red Hat | Red Hat Enterprise Linux 8 | - | cpe:/o:redhat:enterprise_linux:8 | |
| Red Hat | Red Hat Enterprise Linux 9 | - | cpe:/o:redhat:enterprise_linux:9 | |
| Red Hat | Red Hat Hardened Images | - | cpe:/a:redhat:hummingbird:1 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 |
II. Public POCs for CVE-2026-0966
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|---|
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- 2433121 – (CVE-2026-0966) CVE-2026-0966 libssh: Buffer underflow in ssh_get_hexa() on invalid inputissue-trackingx_refsource_REDHAT
- https://nvd.nist.gov/vuln/detail/CVE-2026-0966
Same Patch Batch · Red Hat · 2026-03-26 · 17 CVEs total
| CVE-2025-12805 | 8.1 HIGH | Llama-stack-k8s-operator: llama stack service exposed across namespaces due to missing net |
| CVE-2026-1961 | 8.0 HIGH | Forman: foreman: remote code execution via command injection in websocket proxy |
| CVE-2026-2436 | 6.5 MEDIUM | Libsoup: libsoup: denial of service via use-after-free in soupserver during tls handshake |
| CVE-2026-3121 | 6.5 MEDIUM | Keycloak: org.keycloak/keycloak-services: keycloak: privilege escalation via manage-client |
| CVE-2026-4887 | 6.1 MEDIUM | Gimp: gimp:memory disclosure and denial of service via specially crafted pcx image |
| CVE-2026-4897 | 5.5 MEDIUM | Polkit: polkit: denial of service via unbounded input processing through standard input |
| CVE-2026-2100 | 5.3 MEDIUM | P11-kit: null dereference via c_derivekey with specific null parameters |
| CVE-2026-2272 | 4.3 MEDIUM | Gimp: gimp: memory corruption due to integer overflow in ico file handling |
| CVE-2026-3190 | 4.3 MEDIUM | Keycloak: keycloak: information disclosure via improper role enforcement in uma 2.0 protec |
| CVE-2026-2271 | 3.3 LOW | Gimp: gimp: denial of service via crafted psp image file |
| CVE-2026-0968 | 3.1 LOW | Libssh: libssh: denial of service due to malformed sftp message |
| CVE-2026-4874 | 3.1 LOW | Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side r |
| CVE-2026-2239 | 2.8 LOW | Gimp: gimp: application crash (dos) via crafted psd file due to heap-buffer-overflow |
| CVE-2026-0965 | Libssh: libssh: denial of service via improper configuration file handling | |
| CVE-2026-0967 | Libssh: libssh: denial of service via inefficient regular expression processing | |
| CVE-2026-0964 | Libssh: improper sanitation of paths received from scp servers |
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Same vendor: Red Hat
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