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CVE-2026-55654— Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination

CVSS 3.7 · Low EPSS 0.31% · P22
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I. Basic Information for CVE-2026-55654

Vulnerability Information
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Vulnerability Title
Openssh: heap out-of-bounds read in red hat enterprise linux versions of openssh gssapi indicator cleanup due to missing null sentinel termination
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Enterprise Linux 10-cpe:/o:redhat:enterprise_linux:10
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 Enterprise Linux 9-cpe:/o:redhat:enterprise_linux:9
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-2026-55654

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III. Intelligence Information for CVE-2026-55654

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Other References for CVE-2026-55654 (2)

Same Patch Batch · Red Hat · 2026-06-23 · 12 CVEs total

CVE-2026-118079.6 CRITICALEda-server: websocket missing authorization allows credential theft via activation_id spoo
CVE-2026-121127.8 HIGHForeman-mcp-server: mcp server: active session hijacking via insecure session state reuse
CVE-2026-106096.8 MEDIUMOpenshift/cluster-logging-operator: cluster logging operator creates and forwards servicea
CVE-2026-118206.5 MEDIUMCommunity.general: community.general nexmo — api credentials exposed in get url query stri
CVE-2026-90736.2 MEDIUMForeman-mcp-server: mcp server: insecure sensitive http header sanitization
CVE-2026-118195.5 MEDIUMCommunity.general: community.general keyring_info — os keyring passphrase returned in plai
CVE-2026-129695.3 MEDIUMDnsmasq: dnsmasq: out-of-bounds read in find_soa() due to missing extrabytes validation
CVE-2026-556555.0 MEDIUMOpenssh: local mitm of x11 forwarding via abstract unix socket pre-binding in red hat ente
CVE-2026-128924.4 MEDIUMGstreamer1-plugins-bad: gstreamer1-plugins-bad: 1-byte heap out-of-bounds read in h.264 na
CVE-2026-556534.3 MEDIUMOpenssh: double free in red hat enterprise linux versions of openssh dh-gex client path du
CVE-2026-128914.3 MEDIUMGstreamer1-plugins-bad: gstreamer1-plugins-bad: global buffer overflow (oob read) in h.266

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-55654

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