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CVE-2026-59845— Libssh: libssh: denial of service via unchecked proxycommand fork() failure

CVSS 5.3 · Medium EPSS 0.11% · P2

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 4

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 10anyaffected
Red HatRed Hat Enterprise Linux 8anyaffected
Red HatRed Hat Enterprise Linux 9anyaffected
Red HatRed Hat Hardened Images0.12.1-4.hum1< *unaffected
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I. Basic Information for CVE-2026-59845

Vulnerability Information
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Vulnerability Title
Libssh: libssh: denial of service via unchecked proxycommand fork() failure
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
libssh 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libssh是libssh组织开源的一个用于访问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libssh使用ProxyCommand时未检查fork()失败，导致进程ID -1被存储，清理期间信号可能被发送到调用者可访问的进程树，导致本地拒绝服务。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Hardened Images 0.12.1-4.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red HatRed Hat Enterprise Linux 10-cpe:/o:redhat:enterprise_linux:10
Red HatRed Hat Enterprise Linux 8-cpe:/o:redhat:enterprise_linux:8
Red HatRed Hat Enterprise Linux 9-cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-59845

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III. Intelligence Information for CVE-2026-59845

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Vendor Advisories for CVE-2026-59845 (3)

Same Patch Batch · Red Hat · 2026-07-21 · 20 CVEs total

CVE-2026-598518.8 HIGHLibssh: libssh: authentication bypass via missing gssapi principal check
CVE-2026-164937.8 HIGHAnsible-core: argument injection in ansible-galaxy collection install via git clone (incom
CVE-2026-164457.5 HIGHDracut: dracut: root code execution via dhcp options command injection in networkmanager i
CVE-2026-159276.8 MEDIUMQuay: mirror-registry: ssrf: repo-level mirror accepts external_reference without url vali
CVE-2026-153706.7 MEDIUMLibssh: libssh: stack buffer overflow in sftp server longname construction
CVE-2026-598436.5 MEDIUMLibssh: libssh: denial of service via zero advertised channel packet size
CVE-2026-164616.5 MEDIUMRpcbind: rpcbind: stack buffer overflow in rpcinfo rpcbdump() short-mode version-list form
CVE-2026-598446.5 MEDIUMLibssh: libssh: denial of service via oversized sftp read length
CVE-2026-598475.9 MEDIUMLibssh: libssh: integrity downgrade via openssl aes-gcm tag verification
CVE-2026-158115.8 MEDIUMKronosnet: kronosnet: encryption key exposure in memory after cryptographic configuration
CVE-2026-598485.3 MEDIUMLibssh: libssh: denial of service via sftp responses with unknown request ids
CVE-2026-158124.8 MEDIUMKronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynam
CVE-2026-598504.3 MEDIUMLibssh: libssh: use-after-free via data callbacks on closed channels
CVE-2026-125484.2 MEDIUMLibsoup: heap out-of-bounds read in libsoup due to integer truncation
CVE-2026-598463.9 LOWLibssh: libssh: information disclosure via proxycommand %r username expansion
CVE-2026-598423.7 LOWLibssh: libssh: information disclosure via short gssapi curve25519 public key
CVE-2026-125473.4 LOWLibsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on pr
CVE-2026-598493.1 LOWLibssh: libssh: denial of service via automatic certificate authentication loop
CVE-2026-165172.9 LOWLibarchive: libarchive: signed integer overflow in archive_write_zip_header

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat

V. Comments for CVE-2026-59845

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