> CVE-2026-56740 [HIGH]

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PUBLISHED
2026-07-17 22:17
MODIFIED
2026-07-17 22:17
CVSS_SCORE V3
7.5
EPSS (Prob. Exploit)
0.88%
Top 41.1%
DATA SOURCES:
NVD đź”— 2026-07-17 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-10-25 GITHUB đź”— 2026-11-05 OSV đź”— 2026-09-20

> DESCRIPTION

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 limit the number of environment variables a client may inject via the Telnet NEW-ENVIRON option, and TelnetIO.readNEVariables() in TelnetIO.java:1127-1180 stores each variable pair in a HashMap held by ConnectionData, allowing an unauthenticated attacker to flood unique variable pairs before the terminating IAC SE byte and exhaust JVM heap memory with an OutOfMemoryError. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EXPLOITABILITY
3.9
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
High (H)
Interruption totale du service possible

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
High
Interruption totale du service possible

> WEAKNESSES

CWE-400

> CWE DETAILED DESCRIPTIONS

CWE-400: Uncontrolled Resource Consumption - The product does not properly control the allocation and maintenance of a limited resource.

> GITHUB SECURITY ADVISORY

GHSA-47qp-hqvx-6r3f HIGH

JLine3 Telnet server: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables

AFFECTED PACKAGES:
MAVEN / org.jline:jline-remote-telnet
< 3.30.14
Fixed in: 3.30.14
MAVEN / org.jline:jline-remote-telnet
>= 4.0.0, < 4.0.16
Fixed in: 4.0.16
MAVEN / org.jline:jline-remote-telnet
>= 4.1.0, < 4.2.1
Fixed in: 4.2.1

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

JLine: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables

AFFECTED PACKAGES:
Unknown / Unknown
90 versions affected
ALIASES:
GHSA-47qp-hqvx-6r3f

> HISTORIQUE DES MODIFICATIONS

Première apparition
17/07/2026 22:17
Source: NVD
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-400: Uncontrolled Resource Consumption - The product does not properly control the allocation and maintenance of a limited resource.
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/jline/jline3/commit/0389f0ee6d0375901b602671ad5dafd4d1d4ee09
https://github.com/jline/jline3/commit/4ee3a73849ffb9a85ec748e4e8cd8f6d81f84f40
https://github.com/jline/jline3/commit/934f09e6128cee33c2b13d42b6e859c1ee2d194b
https://github.com/jline/jline3/pull/2000
https://github.com/jline/jline3/pull/2001
https://github.com/jline/jline3/releases/tag/4.0.16
https://github.com/jline/jline3/releases/tag/4.2.1
https://github.com/jline/jline3/releases/tag/jline-3.30.14
https://github.com/jline/jline3/security/advisories/GHSA-47qp-hqvx-6r3f
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