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

🗓️ 18 Jun 2026 13:07:25Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 51 Views

Unauthenticated user floods NEW-ENVIRON vars to exhaust JVM heap in the JLine3 Telnet server.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-56740
17 Jul 202621:17
–attackerkb
cgr
Chainguard
CVE-2026-56740 vulnerabilities
21 Jul 202614:16
–cgr
circl
Circl
CVE-2026-56740
18 Jul 202600:24
–circl
cve
CVE
CVE-2026-56740
17 Jul 202621:17
–cve
cvelist
Cvelist
CVE-2026-56740 JLine: Unauthenticated Remote Memory Exhaustion via Unbounded Telnet NEW-ENVIRON Variables
17 Jul 202621:17
–cvelist
debiancve
Debian CVE
CVE-2026-56740
17 Jul 202621:17
–debiancve
euvd
EUVD
EUVD-2026-45343
17 Jul 202621:17
–euvd
hpe
HPE Security Bulletins
HPESBNW05145 rev.1 - HPE Telco Intelligent Assurance, Multiple Vulnerabilities
3 Sep 202600:00
–hpe
mend
Mend
CVE-2026-56740
17 Jul 202621:17
–mend
nvd
NVD
CVE-2026-56740
17 Jul 202622:17
–nvd
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Vulners
Node
OR
org.jlinejline-remote-telnetRange4.0.0–4.0.16maven
org.jlinejline-remote-telnetRange4.1.0–4.2.1maven

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01 Sep 2026 21:03Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.17.5
EPSS0.00884
SSVC
51