ubuntu-cve-2026-48850
Vulnerability from osv_ubuntu
Published
2026-05-25 21:16
Modified
2026-05-29 17:49
Summary
Details
PuTTY 0.72 before 0.84 has a double free in RSA KEX.
Severity
5.9 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pterm",
"binary_version": "0.67-3+deb9u1build0.16.04.1"
},
{
"binary_name": "putty",
"binary_version": "0.67-3+deb9u1build0.16.04.1"
},
{
"binary_name": "putty-tools",
"binary_version": "0.67-3+deb9u1build0.16.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "putty",
"purl": "pkg:deb/ubuntu/putty@0.67-3+deb9u1build0.16.04.1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.65-2",
"0.66-1",
"0.66-2",
"0.66-3",
"0.66-4",
"0.67-1",
"0.67-2",
"0.67-3build0.16.04.1",
"0.67-3+deb9u1build0.16.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pterm",
"binary_version": "0.70-4"
},
{
"binary_name": "putty",
"binary_version": "0.70-4"
},
{
"binary_name": "putty-tools",
"binary_version": "0.70-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "putty",
"purl": "pkg:deb/ubuntu/putty@0.70-4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.70-1",
"0.70-2",
"0.70-3",
"0.70-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pterm",
"binary_version": "0.73-2"
},
{
"binary_name": "putty",
"binary_version": "0.73-2"
},
{
"binary_name": "putty-tools",
"binary_version": "0.73-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "putty",
"purl": "pkg:deb/ubuntu/putty@0.73-2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.72-1",
"0.73-1",
"0.73-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pterm",
"binary_version": "0.76-2"
},
{
"binary_name": "putty",
"binary_version": "0.76-2"
},
{
"binary_name": "putty-tools",
"binary_version": "0.76-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "putty",
"purl": "pkg:deb/ubuntu/putty@0.76-2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.75-3",
"0.76-1",
"0.76-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pterm",
"binary_version": "0.81-1"
},
{
"binary_name": "putty",
"binary_version": "0.81-1"
},
{
"binary_name": "putty-tools",
"binary_version": "0.81-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "putty",
"purl": "pkg:deb/ubuntu/putty@0.81-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.78-3",
"0.79-1",
"0.80-1",
"0.80-1build2",
"0.80-1build3",
"0.81-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pterm",
"binary_version": "0.83-3"
},
{
"binary_name": "putty",
"binary_version": "0.83-3"
},
{
"binary_name": "putty-tools",
"binary_version": "0.83-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "putty",
"purl": "pkg:deb/ubuntu/putty@0.83-3?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.83-2",
"0.83-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "pterm",
"binary_version": "0.83-3build1"
},
{
"binary_name": "putty",
"binary_version": "0.83-3build1"
},
{
"binary_name": "putty-tools",
"binary_version": "0.83-3build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "putty",
"purl": "pkg:deb/ubuntu/putty@0.83-3build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.83-3",
"0.83-3build1"
]
}
],
"aliases": [],
"details": "PuTTY 0.72 before 0.84 has a double free in RSA KEX.",
"id": "UBUNTU-CVE-2026-48850",
"modified": "2026-05-29T17:49:37Z",
"published": "2026-05-25T21:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-48850"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-48850"
},
{
"type": "REPORT",
"url": "https://lists.tartarus.org/pipermail/putty-announce/2026/000042.html"
},
{
"type": "REPORT",
"url": "https://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/rsakex-double-free.html"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-48850"
]
}
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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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