Is CVE-2026-100836 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-100836?

CVE-2026-100836 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-100836

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.