CVE-2026-100836 MEDIUM

CVE-2026-100836: Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer

Vendor Edgelesssys
Product contrast
Weakness CWE-129
Published September 27, 2026
Last update September 27, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Contrast through 1.20.0 contains a panic vulnerability in the transit-engine endpoint's ciphertextContainer.UnmarshalJSON function that fails to validate decoded ciphertext length before slicing. An authenticated workload with a valid mesh certificate can trigger a runtime panic by submitting a short base64-encoded ciphertext, causing log spam and request failures without crashing the process.

Key dates

02Disclosure timeline

September 27, 2026 CVE published