ubuntu-cve-2026-55653
Vulnerability from osv_ubuntu
Published
2026-06-23 04:17
Modified
2026-07-06 18:42
Summary
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).
Severity
4.3 (Medium)
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:6.6p1-2ubuntu2.13+esm2"
},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
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},
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}
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]
},
{
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},
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{
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{
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{
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{
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}
]
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"binary_version": "1:7.5p1-13"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-13?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-12",
"1:7.5p1-12build1",
"1:7.5p1-13"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "openssh-server",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "openssh-tests",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "ssh",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-preview:22.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu1.fips.0~ppa3?arch=source\u0026distro=fips-preview/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:8.9p1-3ubuntu0.4+Fips1",
"1:8.9p1-3ubuntu0.4+Fips3",
"1:8.9p1-3ubuntu1.fips.0~ppa3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "openssh-server",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "openssh-tests",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "ssh",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:8.9p1-3ubuntu1.fips.0~ppa3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:22.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu1.fips.0~ppa3?arch=source\u0026distro=fips-updates/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:8.9p1-3ubuntu0.4+Fips1",
"1:8.9p1-3ubuntu0.4+Fips3",
"1:8.9p1-3ubuntu0.6+Fips1",
"1:8.9p1-3ubuntu0.7+Fips1",
"1:8.9p1-3ubuntu0.10+Fips1",
"1:8.9p1-3ubuntu0.11+Fips1",
"1:8.9p1-3ubuntu0.13+Fips1",
"1:8.9p1-3ubuntu0.14+Fips1",
"1:8.9p1-3ubuntu0.15+Fips1",
"1:8.9p1-3ubuntu0.15+Fips3",
"1:8.9p1-3ubuntu1.fips.0~ppa3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.5p1-16"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-16?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-14",
"1:7.5p1-15",
"1:7.5p1-15build1",
"1:7.5p1-16"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:9.6p1-3ubuntu13.16+Fips2"
},
{
"binary_name": "openssh-server",
"binary_version": "1:9.6p1-3ubuntu13.16+Fips2"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:9.6p1-3ubuntu13.16+Fips2"
},
{
"binary_name": "openssh-tests",
"binary_version": "1:9.6p1-3ubuntu13.16+Fips2"
},
{
"binary_name": "ssh",
"binary_version": "1:9.6p1-3ubuntu13.16+Fips2"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:9.6p1-3ubuntu13.16+Fips2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:24.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.16+Fips2?arch=source\u0026distro=fips-updates/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:9.6p1-3ubuntu13.7+Fips1",
"1:9.6p1-3ubuntu13.12+Fips1",
"1:9.6p1-3ubuntu13.13+Fips1",
"1:9.6p1-3ubuntu13.14+Fips1",
"1:9.6p1-3ubuntu13.15+Fips1",
"1:9.6p1-3ubuntu13.16+Fips1",
"1:9.6p1-3ubuntu13.16+Fips2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.5p1-17"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-17?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-17"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.5p1-18"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-18?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-17",
"1:7.5p1-18"
]
}
],
"aliases": [],
"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).",
"id": "UBUNTU-CVE-2026-55653",
"modified": "2026-07-06T18:42:26Z",
"published": "2026-06-23T04:17:00Z",
"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"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-55653"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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