All vulnerabilities
CVE-2026-100836GHSA-3ccm-4qq2-5wrpGO-2026-5864

Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer

edgelesssys contrastGoLibraries & packages
Open in ThreatlineRecord JSON
CVSS
5.3Medium
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 28 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.15%Chance of exploitation activity in the next 30 days, higher than 3% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.21.0Fixed versionOSV
Published27 Sep 2026Updated 28 Sep 2026CVE List

What fixes it

  • 1.21.0github.com/edgelesssys/contrast, GoOSVgo get github.com/edgelesssys/contrast@v1.21.0

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 2

  • contrastaffected: all versions through 1.20.0CVE List
  • github.com/edgelesssys/contrast, Gofrom first release, fixed in 1.21.0OSV

References 2