CVE-2026-3609

HIGHNVD 7.87.8—Elevated

7.8

Wellbia's XIGNCODE3 xhunter1.sys kernel driver Privilege Escalation Vulnerability provides access to IRP_MJ_REITS command interface, which allows any user process to request a PROCESS_ALL_ACCESS. Cross reference to KVE 2023-5589 (https://krcert.or.kr)

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 0.4%
KEV: Not listed

Published

May 11, 2026

Last Modified

May 13, 2026

Advisory Details (1)

Auto-updated May 20, 2026

No patch confirmed yet.

generic

CVE-2026-3609: PPL-Bypassing Handle Leak in XIGNCODE3 (xhunter1.sys) | BlackSnufkin

https://blacksnufkin.github.io/posts/AntiCheat-LPE-CVE-2026-3609/

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-23 00:07 UTCEG score recompute
2026-05-20 22:38 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 13:15 UTCEG score recompute
2026-05-20 13:15 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCBlackSnufkin/CredsHunter
First seen May 12, 2026
PoC for CVE-2026-3609 - XIGNCODE3 xhunter1.sys handle leak enabling PPL bypass and LSASS dumping
Open source ↗
GitHub PoCBlackSnufkin/BYOVD
First seen Dec 5, 2023
BYOVD research use cases featuring vulnerable driver discovery and reverse engineering methodology. (CVE-2025-52915, CVE-2025-1055, CVE-2026-3609).
Open source ↗

Frequently asked(5)

What is CVE-2026-3609?

CVE-2026-3609 is a high vulnerability published on May 11, 2026. Wellbia's XIGNCODE3 xhunter1.sys kernel driver Privilege Escalation Vulnerability provides access to IRPMJREITS command interface, which allows any user process to request a PROCESSALLACCESS. Cross reference to KVE 2023-5589 (https://krcert.or.kr)

When was CVE-2026-3609 disclosed?

CVE-2026-3609 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-3609 actively exploited?

CVE-2026-3609 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-3609?

CVE-2026-3609 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2026-3609?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3609, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-3609

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