CVE-2026-100836CWE-129

CVE-2026-100836

Medium · published September 27, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
3.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
5.3 · 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
EPSS
0.00147 · 3.6th percentile
Weakness
CWE-129 · Improper Validation of Array Index
Published
2026-09-27T06:17Z
References (3)
https://github.com/edgelesssys/contrast/security/advisories/GHSA-3ccm-4qq2-5wrp · [email protected]https://www.vulncheck.com/advisories/edgeless-systems-contrast-through-1.20.0-denial-of-service-via-ciphertextcontainer · [email protected]https://github.com/edgelesssys/contrast/security/advisories/GHSA-3ccm-4qq2-5wrp · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 28 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 27 SEP 01:29Z
    Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer
    cvelistv5