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

VendorProductVersions
jlinejline3< 3.30.14, >= 4.0.0, < 4.0.16, >= 4.1.0, < 4.2.1
chainguardhadoop-client-modules0, 0, 0
chainguardapache-hop-fips0, 0, 0
chainguardkafka-4.30, 0, 0
chainguardzookeeper-3.80, 0
wolfizookeeper-3.90, 0, 0
chainguardtez0, 0
wolficonfluent-kafka0, 0, 0
chainguardspark-fips-3.50, 0, 0
chainguardspark-3.50, 0, 0
chainguardzookeeper-fips-3.90, 0
wolfikafka-4.20, 0, 0
wolfitez0, 0, 0
chainguardkafka-4.00, 0, 0
chainguardpinot0, 0, 0
chainguardkafka-4.10, 0, 0
chainguardapache-hop0, 0, 0
chainguardapache-pulsar-4.00, 0, 0
wolfiapache-nifi0, 0, 0
chainguardspark-kubernetes-operator-fips0, 0, 0

…and 21 more

Timeline

  • Jun 18, 2026 CVE Published
  • Jul 18, 2026 Coalition ESS Score
  • Jul 18, 2026 Security Advisory
  • Aug 7, 2026 EPSS Score

References

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