CVE catalog
CVE-2026-56740
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 i
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.88% · Oct 27, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | jline | sid | 1.0-3 | unknown |
| Debian | jline | forky | 1.0-3 | unknown |
| Debian | jline | trixie | 1.0-3 | unknown |
| Debian | jline | bookworm | 1.0-3 | unknown |
| Debian | jline2 | sid | 2.14.6-6 | unknown |
| Debian | jline2 | forky | 2.14.6-6 | unknown |
| Debian | jline2 | trixie | 2.14.6-6 | unknown |
| Debian | jline2 | bookworm | 2.14.6-5 | unknown |
| Debian | jline3 | sid | 3.3.1-5 | vulnerable |
| Debian | jline3 | forky | 3.3.1-5 | vulnerable |
| Debian | jline3 | trixie | 3.3.1-4 | vulnerable |
| Debian | jline3 | bookworm | 3.3.1-3 | vulnerable |
| Cpe | jline | Not reported | Not reported | vulnerable |
| Cpe | jline2 | Not reported | Not reported | vulnerable |
| Cpe | jline3 | Not reported | Not reported | vulnerable |
| Cpe | jline | Not reported | 4.2.1 | fixed |
| Maven | org.jline:jline-remote-telnet | Not reported | 3.30.14 | fixed |
| Suse | jline3 | linux enterprise server 16.0 | 3.30.15-160000.1.1 | fixed |
| Suse | jline3 | linux enterprise server for sap applications 16.0 | 3.30.15-160000.1.1 | fixed |
| Opensuse | jline3 | leap 16.0 | 3.30.15-160000.1.1 | fixed |
| Opensuse | jline3 | tumbleweed | 3.30.15-3.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | jline | source | sid | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline | source | forky | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline2 | source | sid | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline2 | source | forky | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline2 | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline2 | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | jline3 | source | sid | (unfixed) | not yet assigned | Not reported | [1143458] |
| Debian | jline3 | source | forky | (unfixed) | not yet assigned | Not reported | [1143458] |
| Debian | jline3 | source | trixie | (unfixed) | not yet assigned | Not reported | [1143458] |
| Debian | jline3 | source | bookworm | (unfixed) | not yet assigned | Not reported | [1143458] |
| Cpe | jline | cpe | Not reported | 4.2.1 | Not reported | NVD-CVE-2026-56740 | Not reported |
| Maven | org.jline:jline-remote-telnet | maven | Not reported | 3.30.14 | Not reported | GHSA-47QP-HQVX-6R3F | Not reported |
| Suse | jline3 | rpm | linux enterprise server 16.0 | 3.30.15-160000.1.1 | Not reported | SUSE-SU-2026:22856-1 | Not reported |
| Suse | jline3 | rpm | linux enterprise server for sap applications 16.0 | 3.30.15-160000.1.1 | Not reported | SUSE-SU-2026:22856-1 | Not reported |
| Opensuse | jline3 | rpm | leap 16.0 | 3.30.15-160000.1.1 | Not reported | OPENSUSE-SU-2026:21423-1 | Not reported |
| Opensuse | jline3 | rpm | tumbleweed | 3.30.15-3.1 | Not reported | OPENSUSE-SU-2026:11338-1 | Not reported |
Notes
[trixie] jline3: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libjline2-java]Affected
Source package: [jline2]
Details (2)
2.14.6-5· all · bookwormAffected
nvd · jline2 · debian · bookworm; nvd · jline2 · debian · 12
2.14.6-5· all · bookwormAffected
nvd · jline2 · debian · bookworm; nvd · jline2 · debian · 12
- [libjline3-java]Affected
Source package: [jline3]
Details (2)
3.3.1-3· all · bookwormAffected
nvd · jline3 · debian · bookworm; nvd · jline3 · debian · 12
3.3.1-3· all · bookwormAffected
nvd · jline3 · debian · bookworm; nvd · jline3 · debian · 12
- [libjline-java]Affected
Source package: [jline]
Details (2)
1.0-3· all · bookwormAffected
nvd · jline · debian · bookworm; nvd · jline · debian · 12
1.0-3· all · bookwormAffected
nvd · jline · debian · bookworm; nvd · jline · debian · 12
- [libjline-java-doc]Affected
Source package: [jline]
Details (2)
1.0-3· all · bookwormAffected
nvd · jline · debian · bookworm; nvd · jline · debian · 12
1.0-3· all · bookwormAffected
nvd · jline · debian · bookworm; nvd · jline · debian · 12
[Debian 13 (Trixie)]
- [libjline2-java]Affected
Source package: [jline2]
Details (2)
2.14.6-6· all · trixieAffected
nvd · jline2 · debian · 13
2.14.6-6· all · trixieAffected
nvd · jline2 · debian · 13
- [libjline3-java]Affected
Source package: [jline3]
Details (2)
3.3.1-4· all · trixieAffected
nvd · jline3 · debian · 13
3.3.1-4· all · trixieAffected
nvd · jline3 · debian · 13
- [libjline-java]Affected
Source package: [jline]
Details (2)
1.0-3· all · trixieAffected
nvd · jline · debian · 13
1.0-3· all · trixieAffected
nvd · jline · debian · 13
- [libjline-java-doc]Affected
Source package: [jline]
Details (2)
1.0-3· all · trixieAffected
nvd · jline · debian · 13
1.0-3· all · trixieAffected
nvd · jline · debian · 13
[openSUSE Tumbleweed]
- [jline3-builtins]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-console]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-console-ui]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-curses]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-jansi]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· x86_64 · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-jansi-core]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-javadoc]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-native]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· x86_64 · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-reader]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-remote-telnet]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-style]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
- [jline3-terminal]Unknown
Source package: [jline3]
Details (1)
3.30.16-1.2· noarch · tumbleweedUnknown · Fixed:
3.30.15-3.1Version impact unknown
nvd · jline3 · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11338-1.json]
- [https://github.com/advisories/GHSA-47qp-hqvx-6r3f]
- [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]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56740]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-56740]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22856-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11338-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21423-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-56740]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56740.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]