GHSA-rh99-wc69-c255: Github.com/edgelesssys/contrast Contras Affected By CopyFile Policy Vulnerability
HIGHGHSA-rh99-wc69-c255 is a HIGH (CVSS 8.1) contras affected by copyfile policy vulnerability (CWE-59: Improper Link Resolution Before File Access ('Link Following')) affecting Github.com/edgelesssys/contrast libraries in the Go ecosystem. The issue involves contras affected by copyfile policy subversion via symlinks. Remediation is available by upgrading affected packages to version 1.19.1.
GHSA-rh99-wc69-c255 at a Glance
Security Impact
CVSS: 8.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
How to Fix GHSA-rh99-wc69-c255
To remediate this vulnerability, upgrade all affected Github.com/edgelesssys/contrast dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/edgelesssys/contrast to 1.19.1Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/edgelesssys/contrastHow to Check if You Are Affected
To determine whether your application is affected by GHSA-rh99-wc69-c255, inspect your project dependencies for Github.com/edgelesssys/contrast:
inspect dependencies for github.com/edgelesssys/contrastAnalyze the terminal output to locate any version of Github.com/edgelesssys/contrast in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.19.1), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-59: Improper Link Resolution Before File Access ('Link Following'), where the product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. In Github.com/edgelesssys/contrast, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
GHSA-rh99-wc69-c255 Affected Github.com/edgelesssys/contrast Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/edgelesssys/contrast
|
Go |
< 1.19.1
|
1.19.1
|
References
Frequently Asked Questions
What is GHSA-rh99-wc69-c255?
Which Github.com/edgelesssys/contrast versions are affected?
What version fixes GHSA-rh99-wc69-c255?
Is github.com/edgelesssys/contrast affected?
What is the CVSS score of GHSA-rh99-wc69-c255?
What CWE is associated with GHSA-rh99-wc69-c255?
How can I check Go dependencies for GHSA-rh99-wc69-c255?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-rh99-wc69-c255",
"modified" : "2026-04-30T20:57:17Z",
"published" : "2026-04-30T20:57:17Z",
"aliases" : [ ],
"summary" : "Contras Affected by CopyFile Policy Subversion via Symlinks",
"details" : "### Impact\n\nThe [Kata agent policies](https://docs.edgeless.systems/contrast/architecture/components/policies) generated by the Contrast CLI had an issue in the `CopyFile` verification, which allowed arbitrary writes to the guest root filesytem. A malicious process on the host with the capability to connect to the Kata agent VSOCK could connect to the agent and issue a series of `CopyFile` requests to overwrite security-critical files or trick the workload into disclosing sensitive data, which effectively amounts to a full guest takeover.\n\n### Patches\n\nThis issue has been patched in Contrast v1.19.1.\n\nNote that this fix does not change the fact that host-provided content is generally not trustworthy, as documented.\n\n### Workarounds\n\nIf upgrading is not possible, users can implement the fix in rego and pass it to `contrast generate --policy`. The rego-only fix is a bit trickier than the patch, because the data to check is binary. See the references for details.\n\n### Resources\n\n* Upstream GHSA: https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc\n* Alternative policy-only fix: https://gist.github.com/burgerdev/304dd0ab0fff1665b7c27e18a30cf96e",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/edgelesssys/contrast"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "1.19.1"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255"
}, {
"type" : "WEB",
"url" : "https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc"
}, {
"type" : "WEB",
"url" : "https://gist.github.com/burgerdev/304dd0ab0fff1665b7c27e18a30cf96e"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/edgelesssys/contrast"
}, {
"type" : "WEB",
"url" : "https://github.com/edgelesssys/contrast/releases/tag/v1.19.1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-59" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-04-30T20:57:17Z",
"nvd_published_at" : null
}
}