Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer
Priority MEDIUM 57CWE-129Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00177 7th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| edgelesssys | contrast | up to 1.20.0 | — | No fix listed | CNA |
- contrast Vendoredgelesssys Affected up to 1.20.0 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-100836
- 2026-10-03 Alias added: GHSA-x66w-59x9-vvcf
References
More edgelesssys vulnerabilities
- TI-2026-64973 Contrast before 1.16.0 Remote Attestation Relay Attack CVSS 4.0CRITICAL 9.1
- TI-2026-64976 Contrast before 1.19.1 CopyFile Policy Symlink Subversion CVSS 4.0HIGH 8.6
- TI-2026-64971 Contrast before 1.23.1 Image Substitution via Policy Generation CVSS 4.0HIGH 8.6
- TI-2026-71174 Contrast world-writable containerd config allows privilege escalation CVSS 4.0HIGH 8.5
- TI-2025-43536 Contrast before 1.8.1 Information Disclosure via Logging CVSS 4.0HIGH 8.5
- TI-2025-43534 Edgelesssys Contrast before 1.12.2 Workload Secrets Information Disclosure CVSS 4.0HIGH 8.5
Sources
- CVE-2026-100836 · CVE Program
- CVE-2026-100836 · NVD
- FIRST EPSS
- GHSA-x66w-59x9-vvcf · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences