CVE-2026-100723

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory published 2026-09-27. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

vm2 before 3.12.2 does not apply its Buffer backing-store ownership invariant (byteOffset === 0 and buffer.byteLength === length) to Buffers returned from host builtin modules. When an application explicitly exposes Node's zlib module through NodeVM's builtin allowlist (require: { builtin: ['zlib'] }), zlib.deflateSync can return a Buffer backed by Node's shared small-buffer pool whose .buffer is the entire pool. Untrusted guest code can construct a full-width view of that ArrayBuffer (Buffer.from(result.buffer, 0, result.buffer.byteLength)) to read and modify bytes belonging to unrelated host buffers, disclosing and corrupting host-realm memory across the sandbox boundary.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
50
EG Risk 50/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 27, 2026

Last Modified

October 1, 2026

Advisory Details (4)

Auto-updated Sep 27, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic

vm2 before 3.12.2 Memory Disclosure via zlib Buffer Pool | Advisories | VulnCheck

https://www.vulncheck.com/advisories/vm2-before-3.12.2-memory-disclosure-via-zlib-buffer-pool
github_commit Patch Available

commit 5214b02ef13b (patriksimek/vm2)

Patch available: patriksimek/vm2 v3.11.7 (contains commit 5214b02ef13b)

https://github.com/patriksimek/vm2/commit/5214b02ef13b82497fcb917b45320dfd014ffd09
github_commit Patch Available

commit 4f2508abeb25 (patriksimek/vm2)

Patch available: patriksimek/vm2 v3.11.7 (contains commit 4f2508abeb25)

https://github.com/patriksimek/vm2/commit/4f2508abeb252aa86eb6761c78b3b000248fb089
github Patch Available🟡 PoC Available

NodeVM zlib Buffers expose pooled host memory across the VM boundary · Advisory · patriksimek/vm2 · GitHub

https://github.com/patriksimek/vm2/security/advisories/GHSA-489w-w794-jq94

Vendor Advisories for CVE-2026-100723(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 28× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 06:06 UTCGHSA enrichment
  2. 2026-10-03 18:23 UTCEG score recompute
  3. 2026-10-03 18:23 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 06:35 UTCGHSA enrichment
  6. 2026-10-02 18:51 UTCEG score recompute
  7. 2026-10-02 18:51 UTCGHSA enrichment
  8. 2026-10-02 07:08 UTCEG score recompute
  9. 2026-10-02 07:08 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 19:24 UTCEG score recompute
  12. 2026-10-01 19:24 UTCGHSA enrichment
  13. 2026-10-01 18:23 UTCEG score recompute
  14. 2026-10-01 18:23 UTCGHSA enrichment
  15. 2026-10-01 12:11 UTCGHSA enrichment
  16. 2026-10-01 00:28 UTCEG score recompute
  17. 2026-10-01 00:27 UTCGHSA enrichment
  18. 2026-09-30 15:02 UTCEPSS rescore
  19. 2026-09-30 12:42 UTCGHSA enrichment
  20. 2026-09-30 00:58 UTCEG score recompute
  21. 2026-09-30 00:58 UTCGHSA enrichment
  22. 2026-09-29 15:20 UTCEPSS rescore
  23. 2026-09-29 13:14 UTCGHSA enrichment
  24. 2026-09-29 01:30 UTCEG score recompute
  25. 2026-09-29 01:30 UTCGHSA enrichment
Show 8 more
  1. 2026-09-28 13:50 UTCEPSS rescore
  2. 2026-09-28 13:47 UTCGHSA enrichment
  3. 2026-09-28 02:03 UTCGHSA enrichment
  4. 2026-09-27 14:20 UTCEG score recompute
  5. 2026-09-27 14:20 UTCGHSA enrichment
  6. 2026-09-27 02:37 UTCEG score recompute
  7. 2026-09-27 01:53 UTCEG score recompute
  8. 2026-09-27 01:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100723?
CVE-2026-100723 is a high vulnerability published on September 27, 2026. vm2 before 3.12.2 does not apply its Buffer backing-store ownership invariant (byteOffset === 0 and buffer.byteLength === length) to Buffers returned from host builtin modules. When an application explicitly exposes Node's zlib module through NodeVM's builtin allowlist (require: { builtin: ['zlib']…
When was CVE-2026-100723 disclosed?
CVE-2026-100723 was first published on September 27, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100723 actively exploited?
CVE-2026-100723 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100723?
CVE-2026-100723 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100723?
A fix for CVE-2026-100723 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100723 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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