CVE-2026-100836

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.

Affected Software

Weaknesses

• CWE-129: Improper Validation of Array Index

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/edgelesssys/contrast/security/advisories/GHSA-3ccm-4qq2-5wrp

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

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