VDB

CVE-2026-56741

CVE-2026-56741 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 apply an upper bound to terminal dimensions received via the Telnet NAWS option, and TelnetIO.handleNAWS() in TelnetIO.java:856-879 reads client-supplied width and height as 16-bit unsigned integers and passes values such as 65535x65535 to setTerminalGeometry(), allowing an unauthenticated remote attacker to repeatedly alternate values and trigger continuous expensive rendering work that causes CPU exhaustion and denial of service. 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
jlinejline3< 3.30.14, >= 4.1.0, < 4.2.1, >= 4.0.0, < 4.0.16
chainguardapache-pulsar-fips-4.20, 0, 0
chainguardapache-nifi0, 0, 0
chainguardtez0, 0
chainguardconfluent-kafka-jre-bcfips0, 0, 0
wolfikafka-4.20, 0, 0
chainguardapache-hop0, 0, 0
chainguardconfluent-kafka0, 0, 0
wolfizookeeper-3.90, 0, 0
chainguardkafka-fips-4.10, 0, 0
wolfiapache-nifi0, 0, 0
chainguardspark-kubernetes-operator0, 0, 0
chainguardkafka-4.20, 0, 0
chainguardzookeeper-3.80, 0
chainguardkafka-4.10, 0, 0
chainguardzookeeper-3.90, 0
chainguardhadoop-fips-3.3.60, 0, 0
chainguardkafka-fips-4.20, 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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