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Advisory record · GHSA-3ccm-4qq2-5wrp

Constrata's coordinator transit engine `ciphertextContainer.UnmarshalJSON` panics on attacker-controlled short ciphertexts

CVSS 5.3 MediumEPSS 0.0018 · 7th percentile

Published by the GitHub Advisory Database at 1 Jul 2026, 18:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/edgelesssys/contrastGo<1.21.01.21.0
Identifiers
GHSA-3ccm-4qq2-5wrp · CVE-2026-100836 · GO-2026-5864
Weakness (CWE)
CWE-129
Tags
Published
1 Jul 2026
Updated
27 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Constrata's Contrast Coordinator (github.com/edgelesssys/contrast) versions before 1.21.0 panic in the transit engine's ciphertext parsing when a request carries a ciphertext whose decoded payload is shorter than 12 bytes. An attacker needs a workload with a valid mesh certificate for a workload secret ID, which the advisory says is easy to obtain for any registered workload. Triggering the panic is recovered by Go's HTTP server, so the Coordinator stays up, but it floods logs and the request fails. Upgrade to version 1.21.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0018, the 7th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.