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CVE-2026-0966— Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()

AI Predicted 5.9 Difficulty: Easy EPSS 0.06% · P20

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 9

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 100:0.12.0-2.el10< *unaffected
Red HatRed Hat Enterprise Linux 6anyunaffected
Red HatRed Hat Enterprise Linux 7anyunaffected
Red HatRed Hat Enterprise Linux 8anyaffected
Red HatRed Hat Enterprise Linux 90:0.10.4-18.el9< *unaffected
0:0.10.4-18.el9< *unaffected
Red HatRed Hat Hardened Images0.12.0-1.1.hum1< *unaffected
anyunaffected
Red HatRed Hat OpenShift Container Platform 4anyaffected
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I. Basic Information for CVE-2026-0966

Vulnerability Information
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Vulnerability Title
Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service 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

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Enterprise Linux 10 0:0.12.0-2.el10 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red HatRed Hat Enterprise Linux 9 0:0.10.4-18.el9 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red HatRed Hat Enterprise Linux 9 0:0.10.4-18.el9 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red HatRed Hat Hardened Images 0.12.0-1.1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat Enterprise Linux 7-cpe:/o:redhat:enterprise_linux:7
Red HatRed Hat Enterprise Linux 8-cpe:/o:redhat:enterprise_linux:8
Red HatRed Hat Hardened Images-cpe:/a:redhat:hummingbird:1
Red HatRed Hat OpenShift Container Platform 4-cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-0966

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III. Intelligence Information for CVE-2026-0966

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Vendor Advisories for CVE-2026-0966 (5)

Same Patch Batch · Red Hat · 2026-03-26 · 17 CVEs total

CVE-2025-128058.1 HIGHLlama-stack-k8s-operator: llama stack service exposed across namespaces due to missing net
CVE-2026-19618.0 HIGHForman: foreman: remote code execution via command injection in websocket proxy
CVE-2026-24366.5 MEDIUMLibsoup: libsoup: denial of service via use-after-free in soupserver during tls handshake
CVE-2026-31216.5 MEDIUMKeycloak: org.keycloak/keycloak-services: keycloak: privilege escalation via manage-client
CVE-2026-48876.1 MEDIUMGimp: gimp:memory disclosure and denial of service via specially crafted pcx image
CVE-2026-48975.5 MEDIUMPolkit: polkit: denial of service via unbounded input processing through standard input
CVE-2026-21005.3 MEDIUMP11-kit: null dereference via c_derivekey with specific null parameters
CVE-2026-22724.3 MEDIUMGimp: gimp: memory corruption due to integer overflow in ico file handling
CVE-2026-31904.3 MEDIUMKeycloak: keycloak: information disclosure via improper role enforcement in uma 2.0 protec
CVE-2026-22713.3 LOWGimp: gimp: denial of service via crafted psp image file
CVE-2026-09683.1 LOWLibssh: libssh: denial of service due to malformed sftp message
CVE-2026-48743.1 LOWOrg.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side r
CVE-2026-22392.8 LOWGimp: gimp: application crash (dos) via crafted psd file due to heap-buffer-overflow
CVE-2026-0965Libssh: libssh: denial of service via improper configuration file handling
CVE-2026-0967Libssh: libssh: denial of service via inefficient regular expression processing
CVE-2026-0964Libssh: improper sanitation of paths received from scp servers

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-124

V. Comments for CVE-2026-0966

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