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CVE-2026-77423

7.5 · HIGH

JLine is a Java library for handling console input.

Published Sep 23, 2026CWE-1333EPSS 0.46%

Overview

CVE-2026-77423 is a high-severity vulnerability. It was published on September 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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 less viewer passes user-controlled search and display-filter patterns from getPattern(boolean doDisplayPattern) in builtins/src/main/java/org/jline/builtins/Less.java directly to Java's backtracking regular expression engine and repeatedly applies them to file content. A nested-quantifier expression evaluated against non-matching lines can consume excessive CPU and indefinitely block the session thread, and repeated sessions in Telnet or SSH deployments can exhaust a bounded worker pool. This issue is fixed in versions 3.30.15 and 4.3.1.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/jline/jline3/commit/1d5fc3099e77938b971e197211cad2d4fbb17541GitHubgithub.com/jline/jline3/commit/341ee69ccc57b7733c1b40d6993219b64b3206aeGitHubgithub.com/jline/jline3/pull/2012GitHubgithub.com/jline/jline3/pull/2018GitHubgithub.com/jline/jline3/releases/tag/4.3.1GitHubgithub.com/jline/jline3/releases/tag/jline-3.30.15GitHubgithub.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqxGitHubgithub.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx

How CyberStrike helps

Frequently asked questions

What is CVE-2026-77423?

CVE-2026-77423 is a high-severity vulnerability. It was published on September 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-77423?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-77423?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-77423?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77423 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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