What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-27 · updated 2026-09-28
• Weakness: CWE-129

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.

Affected products

• edgelesssys contrast: through 1.20.0

References

• https://github.com/edgelesssys/contrast/security/advisories/GHSA-3ccm-4qq2-5wrp
• https://www.vulncheck.com/advisories/edgeless-systems-contrast-through-1.20.0-denial-of-service-via-ciphertextcontainer
• https://github.com/edgelesssys/contrast/security/advisories/GHSA-3ccm-4qq2-5wrp

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