{"id":"UBUNTU-CVE-2026-55653","details":"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).","modified":"2026-09-22T22:56:31.015489403Z","published":"2026-06-23T04:17:00Z","upstream":["CVE-2026-55653"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-55653"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-55653"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-55653"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/openssh?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:6.2p2-6","1:6.2p2-6ubuntu1","1:6.4p1-1","1:6.4p1-2","1:6.5p1-1","1:6.5p1-2","1:6.5p1-3","1:6.5p1-4","1:6.5p1-6","1:6.6p1-1","1:6.6p1-2","1:6.6p1-2ubuntu1","1:6.6p1-2ubuntu2","1:6.6p1-2ubuntu2.2","1:6.6p1-2ubuntu2.3","1:6.6p1-2ubuntu2.4","1:6.6p1-2ubuntu2.6","1:6.6p1-2ubuntu2.7","1:6.6p1-2ubuntu2.8","1:6.6p1-2ubuntu2.10","1:6.6p1-2ubuntu2.11","1:6.6p1-2ubuntu2.12","1:6.6p1-2ubuntu2.13","1:6.6p1-2ubuntu2.13+esm1","1:6.6p1-2ubuntu2.13+esm2","1:6.6p1-2ubuntu2.13+esm3","1:6.6p1-2ubuntu2.13+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"1:6.6p1-2ubuntu2.13+esm4","binary_name":"openssh-client"},{"binary_name":"openssh-server","binary_version":"1:6.6p1-2ubuntu2.13+esm4"},{"binary_name":"openssh-sftp-server","binary_version":"1:6.6p1-2ubuntu2.13+esm4"},{"binary_name":"ssh","binary_version":"1:6.6p1-2ubuntu2.13+esm4"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:6.6p1-2ubuntu2.13+esm4"},{"binary_name":"ssh-krb5","binary_version":"1:6.6p1-2ubuntu2.13+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55653.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/openssh?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:6.9p1-2","1:6.9p1-3","1:7.1p1-1","1:7.1p1-3","1:7.1p1-4","1:7.1p1-6","1:7.1p2-1","1:7.1p2-2","1:7.2p1-1","1:7.2p2-1","1:7.2p2-2","1:7.2p2-3","1:7.2p2-4","1:7.2p2-4ubuntu1","1:7.2p2-4ubuntu2.1","1:7.2p2-4ubuntu2.2","1:7.2p2-4ubuntu2.4","1:7.2p2-4ubuntu2.5","1:7.2p2-4ubuntu2.6","1:7.2p2-4ubuntu2.7","1:7.2p2-4ubuntu2.8","1:7.2p2-4ubuntu2.10","1:7.2p2-4ubuntu2.10+esm1","1:7.2p2-4ubuntu2.10+esm2","1:7.2p2-4ubuntu2.10+esm3","1:7.2p2-4ubuntu2.10+esm4","1:7.2p2-4ubuntu2.10+esm5","1:7.2p2-4ubuntu2.10+esm6","1:7.2p2-4ubuntu2.10+esm7","1:7.2p2-4ubuntu2.10+esm8","1:7.2p2-4ubuntu2.10+esm9","1:7.2p2-4ubuntu2.10+esm10"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:7.2p2-4ubuntu2.10+esm10"},{"binary_name":"openssh-client-ssh1","binary_version":"1:7.2p2-4ubuntu2.10+esm10"},{"binary_name":"openssh-server","binary_version":"1:7.2p2-4ubuntu2.10+esm10"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.2p2-4ubuntu2.10+esm10"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm10","binary_name":"ssh"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.2p2-4ubuntu2.10+esm10"},{"binary_version":"1:7.2p2-4ubuntu2.10+esm10","binary_name":"ssh-krb5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55653.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:FIPS:16.04:LTS","purl":"pkg:deb/ubuntu/openssh?arch=source&distro=fips-updates%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.2p2-4ubuntu2.fips.2.2.3","1:7.2p2-4ubuntu2.fips.2.4.1","1:7.2p2-4ubuntu2.fips.2.4.2","1:7.2p2-4ubuntu2.fips.2.8.1","1:7.2p2-4ubuntu2.fips.2.10.1","1:7.2p2-4ubuntu2.fips.2.10.2","1:7.2p2-4ubuntu2.fips.2.10.3","1:7.2p2-4ubuntu2.fips.2.10.4","1:7.2p2-4ubuntu2.fips.2.10.5","1:7.2p2-4ubuntu2.fips.2.10.6","1:7.2p2-4ubuntu2.fips.2.10.7"],"ecosystem_specific":{"binaries":[{"binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7","binary_name":"openssh-client"},{"binary_name":"openssh-client-hmac","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7"},{"binary_name":"openssh-client-ssh1","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7"},{"binary_name":"openssh-server","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7"},{"binary_name":"openssh-server-hmac","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7"},{"binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7","binary_name":"openssh-sftp-server"},{"binary_name":"ssh","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7"},{"binary_version":"1:7.2p2-4ubuntu2.fips.2.10.7","binary_name":"ssh-krb5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55653.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:Pro:FIPS:16.04:LTS","purl":"pkg:deb/ubuntu/openssh?arch=source&distro=fips%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.2p2-4ubuntu2.fips.2.2","1:7.2p2-4ubuntu2.fips.2.2.1","1:7.2p2-4ubun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