# JLine vulnerabilities

Source: https://junglewise.ai/threats/technologies/jline  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/jline.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 5 vulnerabilities in JLine: 0 in the last 7 days and 3 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. Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 3
- All time: 5 (0 critical, 0 exploited in the wild)

## 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 viewer](https://junglewise.ai/threats/cve-2026-77423-jline-is-a-java-library-for-handling-console-input-from-3-0-0) (high, CVSS 7.5, published 23 Sep 2026)
- [CVE-2026-77421: JLine Nano editor ReDoS in regex search mode](https://junglewise.ai/threats/cve-2026-77421-jline-nano-editor-redos-in-regex-search-mode) (medium, CVSS 6.5, published 23 Sep 2026)
- [CVE-2026-77420: JLine HISTORY_IGNORE ReDoS via unescaped regex metacharacters](https://junglewise.ai/threats/cve-2026-77420-jline-history-ignore-redos-via-unescaped-regex-metacharacters) (medium, CVSS 5.5, published 23 Sep 2026)
- [CVE-2026-56741: JLine JLine3 denial of service in Telnet server NAWS handling](https://junglewise.ai/threats/cve-2026-56741-jline-jline3-denial-of-service-in-telnet-server-naws-handling) (high, CVSS 7.5, published 17 Jul 2026)
- [CVE-2026-56740: JLine JLine3 denial of service in Telnet server NEW-ENVIRON handling](https://junglewise.ai/threats/cve-2026-56740-jline-jline3-denial-of-service-in-telnet-server-new-environ) (high, CVSS 7.5, published 17 Jul 2026)

## Most severe JLine vulnerabilities

- [CVE-2026-56741: JLine JLine3 denial of service in Telnet server NAWS handling](https://junglewise.ai/threats/cve-2026-56741-jline-jline3-denial-of-service-in-telnet-server-naws-handling) (high, CVSS 7.5, published 17 Jul 2026)
- [CVE-2026-56740: JLine JLine3 denial of service in Telnet server NEW-ENVIRON handling](https://junglewise.ai/threats/cve-2026-56740-jline-jline3-denial-of-service-in-telnet-server-new-environ) (high, CVSS 7.5, published 17 Jul 2026)
- [CVE-2026-77423: JLine regular expression denial of service in less viewer](https://junglewise.ai/threats/cve-2026-77423-jline-is-a-java-library-for-handling-console-input-from-3-0-0) (high, CVSS 7.5, published 23 Sep 2026)
- [CVE-2026-77421: JLine Nano editor ReDoS in regex search mode](https://junglewise.ai/threats/cve-2026-77421-jline-nano-editor-redos-in-regex-search-mode) (medium, CVSS 6.5, published 23 Sep 2026)
- [CVE-2026-77420: JLine HISTORY_IGNORE ReDoS via unescaped regex metacharacters](https://junglewise.ai/threats/cve-2026-77420-jline-history-ignore-redos-via-unescaped-regex-metacharacters) (medium, CVSS 5.5, published 23 Sep 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 3 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "JLine vulnerabilities", https://junglewise.ai/threats/technologies/jline, 9 November 2026.