{"id":"CVE-2026-55653","aliases":["ALSA-2026:47755","ALSA-2026:47756","ALSA-2026:47757","AZL-91200","BELL-CVE-2026-55653","CLSA-2026-1783694178","CLSA-2026-1783706054","DEBIAN-CVE-2026-55653","EUVD-2026-38412","GHSA-28f3-55mq-pp68","RHSA-2026:36759","RHSA-2026:47755","RHSA-2026:47756","RHSA-2026:47757","RHSA-2026:76748","RHSA-2026:76993","RHSA-2026:80513","RLSA-2026:47755","RLSA-2026:47756","RLSA-2026:47757","UBUNTU-CVE-2026-55653"],"status":"published","title":"Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to client-side denial of service","description":"A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service 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This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).","status":"published","published":"2026-06-23T03:36:22Z","modified":"2026-11-05T21:46:01Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-05T23:02:19.769742Z"}],"ghsa":[{"id":"GHSA-28f3-55mq-pp68","title":"A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in...","description":"A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. 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Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).","status":"published","published":"2026-06-23T04:17:36.6Z","modified":"2026-11-05T22:18:48.41Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-415"],"updated_at":"2026-11-05T23:57:19.370761Z"}],"osv":[{"id":"BELL-CVE-2026-55653","title":"CVE-2026-55653 does not affect BellSoft software","status":"withdrawn","published":"2026-06-24T06:11:28.290245Z","modified":"2026-07-16T07:15:09.77952047Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:24.657778Z"},{"id":"CVE-2026-55653","title":"Openssh: double free in red hat enterprise linux versions of openssh dh-gex client path during fips known-group validation leads to client-side denial of service","description":"A flaw was found in OpenSSH. 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This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).","status":"withdrawn","published":"2026-06-23T04:17:36.6Z","modified":"2026-06-25T02:01:41.652071604Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:57.590991Z"},{"id":"RHSA-2026:36759","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-07-09T10:12:50Z","modified":"2026-10-15T10:17:53Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:19.963895Z"},{"id":"RHSA-2026:47755","title":"Red Hat Security Advisory: openssh security update","status":"published","published":"2026-07-30T10:17:48Z","modified":"2026-10-17T10:14:38Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:20.984762Z"},{"id":"RHSA-2026:47756","title":"Red Hat Security Advisory: openssh security update","status":"published","published":"2026-07-30T10:17:48Z","modified":"2026-10-17T10:14:39Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:20.984762Z"},{"id":"RHSA-2026:47757","title":"Red Hat Security Advisory: openssh security update","status":"published","published":"2026-07-30T10:17:49Z","modified":"2026-10-17T10:14:40Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:20.984762Z"},{"id":"RHSA-2026:76748","title":"Red Hat Security Advisory: openssh security update","status":"published","published":"2026-10-07T10:20:10Z","modified":"2026-10-17T10:20:04Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"RHSA-2026:76993","title":"Red Hat Security Advisory: openssh security update","status":"published","published":"2026-10-07T10:20:18Z","modified":"2026-10-17T10:20:11Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"RHSA-2026:80513","title":"Red Hat Security Advisory: openssh security update","status":"published","published":"2026-10-14T10:31:49Z","modified":"2026-10-17T10:20:37Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:23.547034Z"},{"id":"RLSA-2026:47755","title":"Moderate: openssh security update","description":"OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.\n\nSecurity Fix(es):\n\n* openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Rocky Linux OpenSSH client versions (CVE-2026-55655)\n\n* openssh: Double free in Rocky Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-07-30T12:00:53.025496Z","modified":"2026-07-30T12:30:06.801883462Z","cvss":[{"version":"3.1","score":5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:53:26.111232Z"},{"id":"RLSA-2026:47756","title":"Important: openssh security update","description":"OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.\n\nSecurity Fix(es):\n\n* openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Rocky Linux OpenSSH client versions (CVE-2026-55655)\n\n* openssh: Double free in Rocky Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)\n\n* openssh: Heap out-of-bounds read in Rocky Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination (CVE-2026-55654)\n\n* openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002)\n\n* openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-07-30T18:03:34.878221Z","modified":"2026-07-30T18:25:51.612957622Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:26.111232Z"},{"id":"RLSA-2026:47757","title":"Important: openssh security update","description":"OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.\n\nSecurity Fix(es):\n\n* openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Rocky Linux OpenSSH client versions (CVE-2026-55655)\n\n* openssh: Double free in Rocky Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)\n\n* openssh: Heap out-of-bounds read in Rocky Linux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination (CVE-2026-55654)\n\n* openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002)\n\n* openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-07-30T12:06:30.380063Z","modified":"2026-07-30T12:30:06.784792849Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"high"}],"updated_at":"2026-11-02T15:53:26.111232Z"},{"id":"UBUNTU-CVE-2026-55653","description":"A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).","status":"published","published":"2026-06-23T04:17:00Z","modified":"2026-10-23T04:45:05.298864765Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"medium"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:56:41.382716Z"},{"id":"ALSA-2026:47755","title":"Moderate: openssh security update","description":"OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.  \n\nSecurity Fix(es):  \n\n  * openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in AlmaLinux OpenSSH client versions (CVE-2026-55655)\n  * openssh: Double free in AlmaLinux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-07-29T00:00:00Z","modified":"2026-10-29T11:02:24.759791749Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"ALSA-2026:47756","title":"Important: openssh security update","description":"OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.  \n\nSecurity Fix(es):  \n\n  * openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in AlmaLinux OpenSSH client versions (CVE-2026-55655)\n  * openssh: Double free in AlmaLinux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)\n  * openssh: Heap out-of-bounds read in AlmaLinux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination (CVE-2026-55654)\n  * openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002)\n  * openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-07-29T00:00:00Z","modified":"2026-10-29T11:32:22.620178167Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"ALSA-2026:47757","title":"Important: openssh security update","description":"OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.  \n\nSecurity Fix(es):  \n\n  * openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in AlmaLinux OpenSSH client versions (CVE-2026-55655)\n  * openssh: Double free in AlmaLinux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)\n  * openssh: Heap out-of-bounds read in AlmaLinux versions of OpenSSH GSSAPI indicator cleanup due to missing NULL sentinel termination (CVE-2026-55654)\n  * openssh: OpenSSH: Use-after-free vulnerability during host key re-exchange on the client side (CVE-2026-60002)\n  * openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-07-29T00:00:00Z","modified":"2026-10-29T11:30:36.912910099Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"AZL-91200","title":"CVE-2026-55653 affecting package openssh 9.8p1-10","description":"A flaw was found in OpenSSH. A malicious SSH server can exploit a double free vulnerability in the Diffie-Hellman Group Exchange (DH-GEX) client path. This occurs during FIPS (Federal Information Processing Standards) mode known-group validation when the client processes attacker-controlled DH-GEX group parameters. Successful exploitation leads to client-side process termination, resulting in a Denial of Service (DoS).","status":"published","published":"2026-06-23T04:17:36Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:25.633663Z"},{"id":"CLSA-2026-1783694178","title":"openssh: Fix of CVE-2026-55653","description":"- CVE-2026-55653: fix double free in the DH-GEX client path during FIPS\n  known-group validation that leads to a client-side denial of service","status":"published","published":"2026-07-10T14:36:35Z","modified":"2026-10-26T09:30:25.748011292Z","updated_at":"2026-11-02T15:43:46.151924Z"},{"id":"CLSA-2026-1783706054","title":"openssh: Fix of CVE-2026-55653","description":"- CVE-2026-55653: fix double free in openssh DH-GEX client path during FIPS\n  known-group validation that leads to client-side denial of service","status":"published","published":"2026-07-10T17:54:33Z","modified":"2026-10-26T09:31:14.898582816Z","updated_at":"2026-11-02T15:43:46.151924Z"}]}}