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Medium severity · published Sep 27, 2026
CVE-2026-100836
Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
contrast · edgelesssys
through 1.20.0 · source: vendor
Affected product
CO
contrast
edgelesssys
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100836
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100836
vendor-advisory
https://github.com/edgelesssys/contrast/security/advisories/GHSA-3ccm-4qq2-5wrp
third-party-advisory
https://www.vulncheck.com/advisories/edgeless-systems-contrast-through-1.20.0-denial-of-service-via-ciphertextcontainer
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