CVE-2026-100838

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-27. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Contrast is a confidential-computing runtime for Kubernetes. In versions before 1.19.1, the Kata agent policies generated by the Contrast CLI contained a flaw in the CopyFile verification that allowed arbitrary writes to the guest root filesystem. A malicious process on the untrusted host able to connect to the Kata agent VSOCK could issue a series of CopyFile requests to overwrite security-critical files in the guest or trick the workload into disclosing sensitive data, effectively amounting to a full guest takeover. Users unable to upgrade can apply an equivalent rego policy fix passed to 'contrast generate --policy'.

CVSS v3
8.1
EG Score
8.1HIGHhigh confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity81% × 45%
Exploitation0% × 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
0.2%
EPSS %ILE
11th
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 none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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

September 30, 2026

Advisory Details (2)

Auto-updated Sep 27, 2026
Patch available. Sources: github.
generic

Contrast before 1.19.1 CopyFile Policy Symlink Subversion | Advisories | VulnCheck

https://www.vulncheck.com/advisories/contrast-before-1.19.1-copyfile-policy-symlink-subversion
github Patch Available

CopyFile Policy Subversion via Symlinks · Advisory · edgelesssys/contrast · GitHub

https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255

Vendor Advisories for CVE-2026-100838(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/edgelesssys/contrast—1.19.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 33× in last 7d / 36× 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 09:40 UTCGHSA enrichment
  2. 2026-10-03 22:40 UTCEG score recompute
  3. 2026-10-03 22:40 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 11:41 UTCGHSA enrichment
  6. 2026-10-03 00:21 UTCEG score recompute
  7. 2026-10-03 00:21 UTCGHSA enrichment
  8. 2026-10-02 13:22 UTCGHSA enrichment
  9. 2026-10-02 02:23 UTCEG score recompute
  10. 2026-10-02 02:23 UTCGHSA enrichment
  11. 2026-10-01 19:49 UTCEPSS rescore
  12. 2026-10-01 15:25 UTCGHSA enrichment
  13. 2026-10-01 04:26 UTCGHSA enrichment
  14. 2026-09-30 17:27 UTCEG score recompute
  15. 2026-09-30 17:27 UTCGHSA enrichment
  16. 2026-09-30 17:01 UTCEG score recompute
  17. 2026-09-30 17:01 UTCGHSA enrichment
  18. 2026-09-30 15:02 UTCEPSS rescore
  19. 2026-09-30 11:26 UTCGHSA enrichment
  20. 2026-09-30 00:26 UTCEG score recompute
  21. 2026-09-30 00:26 UTCGHSA enrichment
  22. 2026-09-29 15:20 UTCEPSS rescore
  23. 2026-09-29 13:27 UTCGHSA enrichment
  24. 2026-09-29 02:29 UTCEG score recompute
  25. 2026-09-29 02:29 UTCGHSA enrichment
Show 11 more
  1. 2026-09-28 15:30 UTCEG score recompute
  2. 2026-09-28 15:30 UTCGHSA enrichment
  3. 2026-09-28 13:50 UTCEPSS rescore
  4. 2026-09-28 11:39 UTCGHSA enrichment
  5. 2026-09-28 00:39 UTCEG score recompute
  6. 2026-09-28 00:39 UTCGHSA enrichment
  7. 2026-09-27 13:40 UTCEG score recompute
  8. 2026-09-27 13:40 UTCGHSA enrichment
  9. 2026-09-27 02:37 UTCEG score recompute
  10. 2026-09-27 01:53 UTCEG score recompute
  11. 2026-09-27 01:49 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-100838?
CVE-2026-100838 is a high vulnerability published on September 27, 2026. Contrast is a confidential-computing runtime for Kubernetes. In versions before 1.19.1, the Kata agent policies generated by the Contrast CLI contained a flaw in the CopyFile verification that allowed arbitrary writes to the guest root filesystem. A malicious process on the untrusted host able to…
When was CVE-2026-100838 disclosed?
CVE-2026-100838 was first published on September 27, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100838 actively exploited?
CVE-2026-100838 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100838?
CVE-2026-100838 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100838?
A fix for CVE-2026-100838 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100838 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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