UBUNTU-CVE-2026-77421 (CVE-2026-77421)
Vulnerability from osv_ubuntu – Published: 2026-09-24 00:00 – Updated: 2026-09-24 00:00 – Source website
VLAI
Details
JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java's backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session. This issue is fixed in versions 3.30.15 and 4.3.1.
Severity
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline-java",
"binary_version": "1.0-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "jline",
"purl": "pkg:deb/ubuntu/jline@1.0-2?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
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}
],
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}
],
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]
},
{
"ecosystem_specific": {
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{
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}
]
},
"package": {
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},
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{
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]
},
{
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{
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"name": "jline",
"purl": "pkg:deb/ubuntu/jline@1.0-2?arch=source\u0026distro=xenial"
},
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},
{
"ecosystem_specific": {
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{
"binary_name": "libjline2-java",
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},
"package": {
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},
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{
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{
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"package": {
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},
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{
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline2-java",
"binary_version": "2.14.6-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "jline2",
"purl": "pkg:deb/ubuntu/jline2@2.14.6-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
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],
"versions": [
"2.11-4",
"2.12.1-1",
"2.14.6-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline-java",
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}
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},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "jline",
"purl": "pkg:deb/ubuntu/jline@1.0-2?arch=source\u0026distro=focal"
},
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline2-java",
"binary_version": "2.14.6-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "jline2",
"purl": "pkg:deb/ubuntu/jline2@2.14.6-3?arch=source\u0026distro=focal"
},
"ranges": [
{
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline-java",
"binary_version": "1.0-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "jline",
"purl": "pkg:deb/ubuntu/jline@1.0-3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
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],
"versions": [
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline2-java",
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}
]
},
"package": {
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"name": "jline2",
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},
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{
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline3-java",
"binary_version": "3.3.1-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "jline3",
"purl": "pkg:deb/ubuntu/jline3@3.3.1-2?arch=source\u0026distro=jammy"
},
"ranges": [
{
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{
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}
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],
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline-java",
"binary_version": "1.0-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "jline",
"purl": "pkg:deb/ubuntu/jline@1.0-3?arch=source\u0026distro=noble"
},
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{
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"binary_version": "2.14.6-5"
}
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},
"package": {
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"name": "jline2",
"purl": "pkg:deb/ubuntu/jline2@2.14.6-5?arch=source\u0026distro=noble"
},
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline3-java",
"binary_version": "3.3.1-3ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
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},
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"3.3.1-3ubuntu1"
]
},
{
"ecosystem_specific": {
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{
"binary_name": "libjline-java",
"binary_version": "1.0-3build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "jline",
"purl": "pkg:deb/ubuntu/jline@1.0-3build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
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}
],
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}
],
"versions": [
"1.0-3",
"1.0-3build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline2-java",
"binary_version": "2.14.6-6"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "jline2",
"purl": "pkg:deb/ubuntu/jline2@2.14.6-6?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
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],
"versions": [
"2.14.6-6"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libjline3-java",
"binary_version": "3.3.1-4build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "jline3",
"purl": "pkg:deb/ubuntu/jline3@3.3.1-4build1?arch=source\u0026distro=resolute"
},
"ranges": [
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],
"aliases": [],
"details": "JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in nano editor\u0027s regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java\u0027s backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session. This issue is fixed in versions 3.30.15 and 4.3.1.",
"id": "UBUNTU-CVE-2026-77421",
"modified": "2026-09-24T00:00:00Z",
"published": "2026-09-24T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-77421"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-77421"
},
{
"type": "REPORT",
"url": "https://github.com/jline/jline3/security/advisories/GHSA-ph9c-7hw9-vhhw"
},
{
"type": "REPORT",
"url": "https://github.com/jline/jline3/pull/2018"
},
{
"type": "REPORT",
"url": "https://github.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206ae"
},
{
"type": "REPORT",
"url": "https://github.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541"
},
{
"type": "REPORT",
"url": "https://github.com/jline/jline3/pull/2012"
},
{
"type": "REPORT",
"url": "https://github.com/jline/jline3/releases/tag/4.3.1"
},
{
"type": "REPORT",
"url": "https://github.com/jline/jline3/releases/tag/jline-3.30.15"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-77421"
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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