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CVE-2026-69210

CVE-2026-69210

validatedZero produced an exploit or a check.

GHSA-3j86-pj9g-jchr ↗EUVD-2026-79192 ↗

check availableZero validated a working check for it.not proven exploitableZero has a detection check, but hasn't produced a full working exploit yet.
cve.orgpublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).kevAttacks confirmed in the real world.
maven:org.http4s:http4s-core_2.12 <= 0.23.34; >= 1.0.0-M1, <= 1.0.0-M46
fixed in 0.23.35, 1.0.0-M47
CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
ETK-2026-762, permanent identifier
pkg:maven/org.http4s/http4s-core_2.12
pkg:maven/org.http4s/http4s-core_2.13
pkg:maven/org.http4s/http4s-core_3
cvss7.5cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
+21dTTV
20mAI analysisAnalysis: how long the AI spent reversing this signal.
Check if you are vulnerable
timeline
0 = trigger signal
trigger signal (cve.org) +0dcheck available+21dagent stopped
0
+5d
+10d
+15d

description

http4s-core versions before 0.23.35 and 1.0.0-M47 can mishandle certain extended WebSocket frame lengths when used by an Ember server. A remote client that has completed a WebSocket handshake can cause a worker to loop while CPU and memory consumption grow, disrupting service.

mitigation

Upgrade org.http4s:http4s-core_2.12 to 0.23.35 or later. Upgrade the 2.13 and Scala 3 variants to 0.23.35 or 1.0.0-M47 or later.

fixed in 0.23.35, 1.0.0-M47

check
available
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.
contextual
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.
0.63%49th percentile
agent run time
20m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
2026-09-15 19:19Z
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
–
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual check: a technique exists and was validated, but no deterministic check could cover this one.

source signals

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

  1. 2026-09-15 19:19Z
  2. 2026-09-15 19:19Z

this entry in the feed

GET /api/v1/feed/CVE-2026-69210

{
  "etk_id": "ETK-2026-762",
  "cve_id": "CVE-2026-69210",
  "display_id": "CVE-2026-69210",
  "ghsa_id": "GHSA-3j86-pj9g-jchr",
  "euvd_id": "EUVD-2026-79192",
  "status": "published",
  "anchor_state": "anchored",
  "title": "WebSocket denial of service in http4s-core",
  "summary": "http4s-core versions before 0.23.35 and 1.0.0-M47 can mishandle certain extended WebSocket frame lengths when used by an Ember server. A remote client that has completed a WebSocket handshake can cause a worker to loop while CPU and memory consumption grow, disrupting service.",
  "mitigation": "Upgrade org.http4s:http4s-core_2.12 to 0.23.35 or later. Upgrade the 2.13 and Scala 3 variants to 0.23.35 or 1.0.0-M47 or later.",
  "vendor": "maven",
  "product": "maven:org.http4s:http4s-core_2.12",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 0.23.34"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "0.23.35"
      ],
      "package_name": "org.http4s:http4s-core_2.12",
      "purl": "pkg:maven/org.http4s/http4s-core_2.12"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 0.23.34"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "0.23.35"
      ],
      "package_name": "org.http4s:http4s-core_2.13",
      "purl": "pkg:maven/org.http4s/http4s-core_2.13"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 0.23.34"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "0.23.35"
      ],
      "package_name": "org.http4s:http4s-core_3",
      "purl": "pkg:maven/org.http4s/http4s-core_3"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.0.0-M1, <= 1.0.0-M46"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "1.0.0-M47"
      ],
      "package_name": "org.http4s:http4s-core_2.13",
      "purl": "pkg:maven/org.http4s/http4s-core_2.13"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.0.0-M1, <= 1.0.0-M46"
      ],
      "ecosystem": "maven",
      "fixed_versions": [
        "1.0.0-M47"
      ],
      "package_name": "org.http4s:http4s-core_3",
      "purl": "pkg:maven/org.http4s/http4s-core_3"
    }
  ],
  "cwes": [
    835
  ],
  "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": 0.0063,
  "epss_percentile": 0.4926,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 20.083948716666665,
  "t0_at": "2026-09-15T19:19:04.868000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-06T12:55:54.574588+00:00",
      "days": 20.733908641064815,
      "is_lower_bound": false,
      "measured_at": "2026-09-15T19:19:04.868000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-09-15T19:19:04.868000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-15T19:19:04.868000+00:00",
      "url": "https://github.com/http4s/http4s/security/advisories/GHSA-3j86-pj9g-jchr"
    }
  }
}

published 2026-10-06 12:35Z
last change 2026-10-21 13:12Z

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