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CVE-2026-77423

CVE-2026-77423

waiting for further signalsZero needs more public information before it can validate it.

GHSA-2v9w-34q6-wpqx ↗EUVD-2026-85531 ↗

no check availablenot proven exploitable
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−85dkevAttacks confirmed in the real world.
maven:org.jline:jline-builtins < 4.3.1; >= 3.0.0, < 3.30.15
fixed in 4.3.1, 3.30.15
CWE-1333 Inefficient Regular Expression Complexity
ETK-2026-30, permanent identifier
pkg:maven/org.jline/jline-builtins
cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
9d 06h 44msince last run
24mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = cve.org publication
public poc−2.8motrigger signal (cve.org) +0mowaiting for further signals+0.6mo
−2mo
−1mo
0

description

JLine builtins versions before 3.30.15 and 4.3.1 process user-provided less search and display-filter patterns with an unbounded backtracking regular-expression engine. An attacker who can provide these patterns can consume CPU and block a session thread; repeated use can exhaust bounded session pools in exposed Telnet or SSH deployments.

mitigation

Upgrade org.jline:jline-builtins to version 3.30.15 or 4.3.1. Until upgraded, do not expose the less viewer to untrusted users, or restrict user-controlled search and display-filter patterns.

fixed in 4.3.1, 3.30.15

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
–
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
0.39%31st percentile
agent run time
24m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-23 18:17Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
−85d
Δ to kevAttacks confirmed in the real world.
–

outcome

No artifact: an exploit or check was attempted but could not be produced at this moment.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-09-23 18:17Z
  2. 2026-09-23 18:17Z
  3. 2026-09-23 18:17Z

this entry in the feed

GET /api/v1/feed/CVE-2026-77423

{
  "etk_id": "ETK-2026-30",
  "cve_id": "CVE-2026-77423",
  "display_id": "CVE-2026-77423",
  "ghsa_id": "GHSA-2v9w-34q6-wpqx",
  "euvd_id": "EUVD-2026-85531",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Regular expression denial of service in JLine builtins less pager",
  "summary": "JLine builtins versions before 3.30.15 and 4.3.1 process user-provided `less` search and display-filter patterns with an unbounded backtracking regular-expression engine. An attacker who can provide these patterns can consume CPU and block a session thread; repeated use can exhaust bounded session pools in exposed Telnet or SSH deployments.",
  "mitigation": "Upgrade `org.jline:jline-builtins` to version 3.30.15 or 4.3.1. Until upgraded, do not expose the `less` viewer to untrusted users, or restrict user-controlled search and display-filter patterns.",
  "vendor": "maven",
  "product": "maven:org.jline:jline-builtins",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 4.3.1"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "4.3.1"
      ],
      "package_name": "org.jline:jline-builtins",
      "purl": "pkg:maven/org.jline/jline-builtins"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.0.0, < 3.30.15"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "3.30.15"
      ],
      "package_name": "org.jline:jline-builtins",
      "purl": "pkg:maven/org.jline/jline-builtins"
    }
  ],
  "cwes": [
    1333
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": 0.0039,
  "epss_percentile": 0.3109,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 24.087939283333334,
  "t0_at": "2026-09-23T18:17:49.635000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-06-30T20:15:26+00:00",
      "days": -84.9183291087963,
      "is_lower_bound": false,
      "measured_at": "2026-09-23T18:17:49.635000+00:00",
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx"
    },
    "trigger_signal": {
      "at": "2026-09-23T18:17:49.635000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-23T18:17:49.635000+00:00",
      "url": "https://github.com/jline/jline3/security/advisories/GHSA-2v9w-34q6-wpqx"
    }
  }
}

published 2026-09-29 22:47Z
last change 2026-10-21 05:31Z

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