OBS-2026-000183: CVE-2026-84939

1. Observe What changed? →

2. Understand Why does it matter? →

3. Track How does risk evolve? →

4. Predict What happens next? →

5. Decide What to do? →

6. Verify What happened? →

7. Remember Persistent memory

IMMUTABLE CANONICAL OBSERVATION

OBS-2026-000183

Target Entity: CVE-2026-84939 — Apache FreeMarker Malformed Locale Path Traversal to Remote Template Injection and Code Execution

MODE: RETROSPECTIVE

Methodology: HTS-3.1

Observed UTC:
2026-09-09T00:00:00.000Z

Event Date:
2026-09-09

Epistemic State:
● KNOWN

Cryptographic Digest:
sha256-a3c4b742815b650…

1. Verified Evidence & Observed State

This canonical observation confirms the following factual event on the threat surface:

Hermes Threat Score (HTS)

92 / 100

CRITICAL

CVSS v3.1

9.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS (30-Day Exploitation)

0.2%

Percentile: 51.2th

Weaponization & CISA KEV

🛡️ Not in KEV

Exploit Maturity: poc

2. Decomposed Epistemic Confidence Vector

Hermes rejects false certainty and explicitly exposes its decomposed confidence vector:

Evidence Integrity99%

Model Stability97%

Data Completeness98%

Actionable Decisiveness97%

3. Primary Sources & Provenance Chain

Observation OBS-2026-000183 is strictly anchored to verified records from the following primary entities:

Apache FreeMarker Security Advisory CVE-2026-84939
Apache FreeMarker 2.3.35 Release Commit a892508
NVD CVE-2026-84939 Record

Causal Intelligence Lineage

Primary Source → OBS-2026-000183 → CVE-2026-84939 → Risk Trajectory → Action Directive

4. Target Entity & Correlated Intelligence

Primary Vulnerability Dossier: CVE-2026-84939
Dynamic Risk Trajectories: View risk trajectory analysis
Decision Engine: View prescriptive remediation directives

5. Observation Sequence & Chain of Custody

Chronological lineage for entity CVE-2026-84939:

Preceding Observation: OBS-2026-000182
Succeeding Observation: None (Latest Observation)

Observation ID	Date	Mode	Score	Observed Fact
`OBS-2026-000182`	`2026-09-08`	RETROSPECTIVE	92	Initial baseline observation created upon public disclosure and ingestion.
👉 `OBS-2026-000183`	`2026-09-09`	RETROSPECTIVE	92	State change observed: threat score adjusted by +0 points; CISA KEV or weaponized exploit verified.

6. Reproducibility & Cryptographic Verification

(Section 77 Mandate: “Observations must be reproducible”)

Fetch and verify this observation record directly from the machine-readable API:

# 1. Fetch canonical observation record
curl -sSL https://hermes-codex.vercel.app/api/observations/OBS-2026-000183.json

# 2. Verify cryptographic SHA-256 integrity
curl -sSL https://hermes-codex.vercel.app/api/observations/OBS-2026-000183.json | sha256sum

OASIS STIX 2.1 Mapping (`observed-data`)

{
  "type": "observed-data",
  "spec_version": "2.1",
  "id": "observed-data--7440c604-0c0a-b9d3-dc5a-fb7770c04735",
  "created_by_ref": "identity--hermes-codex-threat-observatory",
  "created": "2026-09-09T00:00:00.000Z",
  "modified": "2026-09-09T00:00:00.000Z",
  "first_observed": "2026-09-09T00:00:00.000Z",
  "last_observed": "2026-09-09T00:00:00.000Z",
  "number_observed": 1,
  "external_references": [
    {
      "source_name": "hermes-codex",
      "external_id": "OBS-2026-000183",
      "url": "https://hermes-codex.vercel.app/observations/obs-2026-000183/"
    }
  ],
  "object_marking_refs": [
    "marking-definition--tlp-clear"
  ],
  "custom_properties": {
    "x_hermes_threat_score": 92,
    "x_hermes_severity": "CRITICAL",
    "x_hermes_epistemic_state": "KNOWN",
    "x_hermes_methodology": "HTS-3.1",
    "x_hermes_integrity_hash": "sha256-a3c4b742815b650570be2b2e6beaeba381b3c2028a2af54b5e2d1d52fbe89673"
  }
}