Technology · JLine
JLine vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 6 vulnerabilities in JLine: 3 in the last 7 days and 5 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-77423, was published on 23 September 2026.
- Last 7 days
- 3
- Last 90 days
- 5
- Critical, all time
- 0
- Exploited in the wild
- 0
About JLine
JLine is a Java library for handling console input, providing features like line editing, history, and tab completion.
Latest JLine vulnerabilities
- CVE-2026-77423: JLine regular expression denial of service in less viewerhighCVSS 7.5EPSS 0.4%
- CVE-2026-77421: 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…mediumCVSS 6.5EPSS 0.4%
- CVE-2026-77420: JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1…mediumCVSS 5.5EPSS 0.1%
- CVE-2026-56741: JLine JLine3 denial of service in Telnet server NAWS handlinghighCVSS 7.5EPSS 0.9%
- CVE-2026-56740: JLine JLine3 denial of service in Telnet server NEW-ENVIRON handlinghighCVSS 7.5EPSS 0.9%
- JLine JLine3 remote-telnet denial of service via unbounded NAWS terminal geometryhighCVSS 7.5
Most severe JLine vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-56741: JLine JLine3 denial of service in Telnet server NAWS handlinghighCVSS 7.5EPSS 0.9%
- CVE-2026-56740: JLine JLine3 denial of service in Telnet server NEW-ENVIRON handlinghighCVSS 7.5EPSS 0.9%
- CVE-2026-77423: JLine regular expression denial of service in less viewerhighCVSS 7.5EPSS 0.4%
- JLine JLine3 remote-telnet denial of service via unbounded NAWS terminal geometryhighCVSS 7.5
- CVE-2026-77421: 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…mediumCVSS 6.5EPSS 0.4%
- CVE-2026-77420: JLine is a Java library for handling console input. From 3.0.0 until 3.30.15 and 4.3.1…mediumCVSS 5.5EPSS 0.1%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 2 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 3 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/jline.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "JLine vulnerabilities", https://junglewise.ai/threats/technologies/jline, 26 September 2026.