High
jline, jline2 and 1 more products — security advisory
JLine is a Java library for handling console input. Prior to 3.30.14, 4.0.16, and 4.2.1, the JLine3 Telnet server remote-telnet module does not apply an upper bound to terminal dimensions received via the Telnet NAWS option, and TelnetIO.handleNAWS() in TelnetIO.java:856-879 reads client-supplied width and height as 16-bit unsigned integers and passes values such as 65535x65535 to setTerminalGeometry(), allowing an unauthenticated remote attacker to repeatedly alternate values and trigger continuous expensive rendering work that causes CPU exhaustion and denial of service. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.
- Products
- jline, jline2, jline3
- Affected versions
- 1.0-2, 1.0-3, 1.0-3build1, 2.11-1, 2.11-2, 2.11-4, 2.12.1-1, 2.14.6-1, 2.14.6-3, 2.14.6-4, 2.14.6-5, 2.14.6-6, 3.3.1-2, 3.3.1-3, 3.3.1-3ubuntu1, 3.3.1-4, 3.3.1-4build1, 3.3.1-5
- Fixed versions
- Not specified
- CVEs
- CVE-2026-56741
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:47 UTC · Revision 1
Source evidence
JLine is a Java library for handling console input. Prior to 3.30.14, 4.0.16, and 4.2.1, the JLine3 Telnet server remote-telnet module does not apply an upper bound to terminal dimensions received via the Telnet NAWS option, and TelnetIO.handleNAWS() in TelnetIO.java:856-879 reads client-supplied width and height as 16-bit unsigned integers and passes values such as 65535x65535 to setTerminalGeometry(), allowing an unauthenticated remote attacker to repeatedly alternate values and trigger continuous expensive rendering work that causes CPU exhaustion and denial of service. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.
osv:UBUNTU-CVE-2026-56741
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline3
Fixed versions: Not specified
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline3
Fixed versions: Not specified
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline3
Fixed versions: Not specified
jline
Fixed versions: Not specified
jline2
Fixed versions: Not specified
jline3
Fixed versions: Not specified
Complete source record
{
"id": "38e7b6b7b567e0e6eee81a1a8684209b16602178ebd58223319d5262a7e8e575",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-56741",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-56741",
"summary": "JLine is a Java library for handling console input. Prior to 3.30.14, 4.0.16, and 4.2.1, the JLine3 Telnet server remote-telnet module does not apply an upper bound to terminal dimensions received via the Telnet NAWS option, and TelnetIO.handleNAWS() in TelnetIO.java:856-879 reads client-supplied width and height as 16-bit unsigned integers and passes values such as 65535x65535 to setTerminalGeometry(), allowing an unauthenticated remote attacker to repeatedly alternate values and trigger continuous expensive rendering work that causes CPU exhaustion and denial of service. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.",
"evidence": "osv:UBUNTU-CVE-2026-56741",
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{
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"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.3.1-4build1",
"evidence": "/affected/16/versions"
},
{
"value": "3.3.1-5",
"evidence": "/affected/16/versions"
}
]
},
{
"name": {
"value": "jline",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/17/versions"
},
{
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"evidence": "/affected/17/versions"
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{
"name": {
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"evidence": "/affected/18/package/name"
},
"prerequisites": [],
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{
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{
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"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-56741",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
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},
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],
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},
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{
"introduced": "0"
}
]
}
],
"package": {
"name": "jline2",
"purl": "pkg:deb/ubuntu/jline2?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2.14.6-6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56741.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline2-java",
"binary_version": "2.14.6-6"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "jline3",
"purl": "pkg:deb/ubuntu/jline3?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"3.3.1-4build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56741.json"
},
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{
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"binary_version": "3.3.1-4build1"
}
]
}
}
],
"modified": "2026-10-17T12:59:10.511454416Z",
"provider": "osv",
"upstream": [
"CVE-2026-56741"
],
"references": [
"https://ubuntu.com/security/CVE-2026-56741",
"https://www.cve.org/CVERecord?id=CVE-2026-56741",
"https://github.com/jline/jline3/security/advisories/GHSA-2r2c-cx56-8933",
"https://github.com/jline/jline3/pull/2000"
]
},
"related_cves": [
{
"value": "CVE-2026-56741",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359381,
"published_at": "2026-07-17T22:17:00+00:00"
}