What is CVE-2026-109359?

CVE-2026-109359 is a high-severity vulnerability in Edgelesssys Contrast, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.7/10. Published 2026-10-12.

How severe is CVE-2026-109359?

High severity. CVSS v3 base score is 7.7 out of 10.

Vulnerability in Edgelesssys Contrast

CVE-2026-109359

Contrast 1.8.0 before 1.24.1 contains an improper verification vulnerability in Coordinator peer recovery that fails to confirm the serving peer uses the same manifest generation. Attackers with write access to manifest history can replay a superseded history head so withdrawn workloads obtain trusted mesh certificates, or with the secret seed disclose the Mesh CA key.

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Edgelesssys Contrast

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

github.com/edgelesssys/contrast/security/advisories/GHSA-rxcv-p3px-m3c3 (vendor-advisory)
www.vulncheck.com/advisories/contrast-1.8.0-before-1.24.1-mesh-ca-key-cross-man… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109359?: CVE-2026-109359 is a high-severity vulnerability in Edgelesssys Contrast, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.7/10. Published 2026-10-12.
How severe is CVE-2026-109359?: High severity. CVSS v3 base score is 7.7 out of 10.