A phantom vulnerability that leaves no footprint in any authoritative database
CVE-2026-107891 cannot be located in the National Vulnerability Database (NVD), MITRE CVE.org, CISA's Known Exploited Vulnerabilities catalog, the FIRST EPSS feed, GitHub Security Advisories, or any vendor advisory, PoC repository, or security news source. Extensive searches across NVD, CVE.org, CISA bulletins (including the September 14, 2026 weekly summary), the SecureWithUmer/CVE-2026-PoCs GitHub repository, pocindex.io, and FIRST's EPSS API all returned zero results. The CVE sequence number (107891) is syntactically valid under the post-2014 CVE numbering scheme, but no CNA has published a record for it.
There is no vendor severity to evaluate because no vendor has claimed this identifier. Without a description, affected product, version range, or any corroborating advisory, noisgate cannot perform a meaningful friction audit or role-blast-radius analysis. This identifier may be reserved-but-unpopulated, a typo, or entirely fictitious. No action is warranted until a real advisory materializes.
1 steps from start to impact.
No attack path can be constructed
- CVE record must exist in at least one authoritative source
- CVE does not exist in NVD, MITRE, CISA, or any vendor advisory
- Patching or workarounds — there is no identified product to patch or mitigate
- Network segmentation — cannot be applied without knowing the affected service
- WAF/IPS signatures — no exploit pattern or affected protocol is known
The supporting signals.
| CVE Record Status | Not found in NVD, CVE.org, or any CNA feed as of 2026-10-22 |
|---|---|
| In-the-Wild Exploitation | None documented. Not listed in CISA KEV. No campaign reports reference this identifier. |
| PoC Availability | None. No results on pocindex.io, GitHub (SecureWithUmer/CVE-2026-PoCs), ExploitDB, or Nuclei templates. |
| EPSS Score | No data. FIRST EPSS API returns an empty result set for this CVE ID. |
| KEV Status | Not listed. Confirmed absent from CISA KEV catalog (checked 2026-10-22). |
| CVSS Vector | None published. No CNA has assigned a CVSS score. |
| Affected Products | Unknown. No advisory identifies an affected vendor or product. |
| Fixed Versions | Unknown. No patch or workaround has been published. |
| Disclosure Date | Unknown. No record of disclosure in any tracked source. |
| Reporting Researcher | Unknown. No credit or attribution found. |
Sources.
Why this verdict
- No CVE record exists: Exhaustive searches of NVD, CVE.org, CISA bulletins, FIRST EPSS, GitHub advisories, and PoC aggregators all return zero results for CVE-2026-107891.
- No affected product identified: Without knowing the affected software, no deployment-role analysis or blast-radius assessment is possible. The role-multiplier rule cannot be applied when the product is unknown.
- Role multiplier: N/A — no product identified, therefore no high-value role can be evaluated. The verdict floor cannot be set without an identifiable component.
- Zero corroborating signals: No KEV listing, no EPSS score, no PoC, no researcher disclosure, no vendor advisory, no media coverage. Every threat-intelligence signal reads null.
- Verdict: IGNORE — this identifier produces no actionable intelligence. It should be flagged for re-evaluation if a record is published in the future.
Why not higher?
There is no basis for assigning any severity above IGNORE. A vulnerability assessment requires, at minimum, a published description identifying an affected product and a flaw class. CVE-2026-107891 has none of these. Assigning even LOW would imply a confirmed defect exists somewhere, which cannot be substantiated.
Why not lower?
IGNORE is the lowest possible verdict in the noisgate framework. There is nothing below it.
Crowdsourced verification payload.
Run this on any workstation with curl and jq installed. It queries NVD and CVE.org for the existence of this CVE record. No special privileges required. Example: bash check_cve_exists.sh CVE-2026-107891
#!/usr/bin/env bash
# check_cve_exists.sh — Verify whether a CVE ID has a published record
# Usage: bash check_cve_exists.sh CVE-YYYY-NNNNN
# Exit codes: 0 = record found (VULNERABLE context exists), 1 = no record (UNKNOWN), 2 = error
set -euo pipefail
CVE_ID="${1:-CVE-2026-107891}"
echo "[*] Checking NVD for ${CVE_ID}..."
NVD_RESP=$(curl -sf "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=${CVE_ID}" 2>/dev/null || echo '{}')
NVD_COUNT=$(echo "${NVD_RESP}" | jq -r '.totalResults // 0' 2>/dev/null || echo 0)
echo "[*] Checking CVE.org for ${CVE_ID}..."
CVEORG_STATUS=$(curl -sf -o /dev/null -w '%{http_code}' "https://cveawg.mitre.org/api/cve/${CVE_ID}" 2>/dev/null || echo '000')
echo "[*] Checking FIRST EPSS for ${CVE_ID}..."
EPSS_RESP=$(curl -sf "https://api.first.org/data/v1/epss?cve=${CVE_ID}" 2>/dev/null || echo '{}')
EPSS_COUNT=$(echo "${EPSS_RESP}" | jq -r '.total // 0' 2>/dev/null || echo 0)
echo ""
echo "=== Results for ${CVE_ID} ==="
echo "NVD records found: ${NVD_COUNT}"
echo "CVE.org HTTP status: ${CVEORG_STATUS}"
echo "EPSS records found: ${EPSS_COUNT}"
echo ""
if [[ "${NVD_COUNT}" -gt 0 ]] || [[ "${CVEORG_STATUS}" == "200" ]]; then
echo "VULNERABLE — CVE record exists. Re-run noisgate assessment with full data."
exit 0
elif [[ "${NVD_COUNT}" -eq 0 ]] && [[ "${CVEORG_STATUS}" != "200" ]] && [[ "${EPSS_COUNT}" -eq 0 ]]; then
echo "UNKNOWN — No CVE record found in any authoritative source. This CVE ID may not exist."
exit 1
else
echo "UNKNOWN — Partial data returned. Manual review recommended."
exit 1
fi