VDB
CVE-2026-56740
CVE-2026-56740
PUBLISHED
CVSS 7.5 HIGH
Reported by GitHub_M · Published July 17, 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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| jline | jline3 | < 3.30.14, >= 4.0.0, < 4.0.16, >= 4.1.0, < 4.2.1 |
| chainguard | hadoop-client-modules | 0, 0, 0 |
| chainguard | ranger | 0, 0, 0 |
| chainguard | spark-4.2 | 0, 0 |
| chainguard | apache-hop-fips | 0, 0, 0 |
| chainguard | kafka-4.3 | 0, 0, 0 |
| chainguard | zookeeper-3.8 | 0, 0, 0 |
| wolfi | zookeeper-3.9 | 0, 0, 0 |
| chainguard | tez | 0, 0, 0 |
| wolfi | confluent-kafka | 0, 0, 0 |
| chainguard | spark-fips-3.5 | 0, 0, 0 |
| chainguard | spark-3.5 | 0, 0, 0 |
| chainguard | kafka-3.8 | 0, 0 |
| chainguard | zookeeper-fips-3.9 | 0, 0, 0 |
| wolfi | kafka-4.2 | 0, 0, 0 |
| wolfi | tez | 0, 0, 0 |
| chainguard | kafka-4.0 | 0, 0, 0 |
| chainguard | spark-4.1 | 0, 0 |
| chainguard | pinot | 0, 0, 0 |
| chainguard | kafka-4.1 | 0, 0, 0 |
…and 34 more
Timeline
- Jun 18, 2026 CVE Published
- Jul 18, 2026 Coalition ESS Score
- Jul 18, 2026 Security Advisory
- Aug 7, 2026 EPSS Score
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 28, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 5, 2026 EPSS Score
- Sep 6, 2026 EPSS Score
- Sep 9, 2026 EPSS Score
References
- https://github.com/jline/jline3/security/advisories/GHSA-47qp-hqvx-6r3f x_refsource_CONFIRM
- https://github.com/jline/jline3/pull/2000 x_refsource_MISC
- https://github.com/jline/jline3/pull/2001 x_refsource_MISC
- https://github.com/jline/jline3/commit/0389f0ee6d0375901b602671ad5dafd4d1d4ee09 x_refsource_MISC
- https://github.com/jline/jline3/commit/4ee3a73849ffb9a85ec748e4e8cd8f6d81f84f40 x_refsource_MISC
- https://github.com/jline/jline3/commit/934f09e6128cee33c2b13d42b6e859c1ee2d194b x_refsource_MISC
- https://github.com/jline/jline3/releases/tag/4.0.16 x_refsource_MISC
- https://github.com/jline/jline3/releases/tag/4.2.1 x_refsource_MISC
- https://github.com/jline/jline3/releases/tag/jline-3.30.14 x_refsource_MISC