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CVE-2026-56740VulnerabilityPublished Updated

SUSE jline · Security update for jline3

Affects SUSE jlineSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-56740· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 18 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10jlinepkg:deb/ubuntu/jline?arch=source&distro=stonkingOther threatsAffected
  • =1.0-3build1
Fixed in–
Ubuntu 26.10jline2pkg:deb/ubuntu/jline2?arch=source&distro=stonkingOther threatsAffected
  • =2.14.6-6
Fixed in–
Ubuntu 26.10jline3pkg:deb/ubuntu/jline3?arch=source&distro=stonkingOther threatsAffected
  • =3.3.1-4build1
  • =3.3.1-5
Fixed in–
Ubuntu 26.04 LTSjlinepkg:deb/ubuntu/jline?arch=source&distro=resoluteOther threatsAffected
  • =1.0-3
  • =1.0-3build1
Fixed in–
Ubuntu 26.04 LTSjline2pkg:deb/ubuntu/jline2?arch=source&distro=resoluteOther threatsAffected
  • =2.14.6-6
Fixed in–
Ubuntu 26.04 LTSjline3pkg:deb/ubuntu/jline3?arch=source&distro=resoluteOther threatsAffected
  • =3.3.1-4
  • =3.3.1-4build1
Fixed in–

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Description

This update for jline3 fixes the following issues: - CVE-2026-56740: unauthenticated remote memory exhaustion via unbounded Telnet `NEW-ENVIRON` variables (bsc#1269021). - CVE-2026-56741: unauthenticated remote DoS via Unbounded Telnet NAWS Terminal Geometry (bsc#1270083). Changes for jline3: - Update to upstream version 3.30.15 + fix: guard regex matching against catastrophic backtracking (ReDoS) (#2018, backport of #2012): * Adds SafeRegex utility with TimeoutCharSequence to enforce wall-clock deadlines during regex matching * Fixes 8 locations across terminal, reader, and builtins where user-controlled input could trigger catastrophic backtracking * Addresses GHSA-r2xf-8xr9-62gw, GHSA-2v9w-34q6-wpqx, GHSA-ph9c-7hw9-vhhw, GHSA-5q95-hrpc-m3w3 + fix: backport security hardening (#1986, #1995): * Create persisted history file with owner-only permissions * Use exclusive create for extracted native library temp files + fix: warn on insecure permissions when history file created concurrently

References

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