350 lines
16 KiB
JSON
350 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-27896",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-02-24T15:19:29.717Z",
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"datePublished": "2026-02-26T00:47:46.967Z",
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"dateUpdated": "2026-09-16T12:04:21.685Z"
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},
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"containers": {
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"cna": {
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"title": "MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-178",
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"lang": "en",
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"description": "CWE-178: Improper Handling of Case Sensitivity",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-436",
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"lang": "en",
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"description": "CWE-436: Interpretation Conflict",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "HIGH",
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"subIntegrityImpact": "HIGH",
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"subAvailabilityImpact": "NONE",
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"baseScore": 7,
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
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"version": "4.0"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-wvj2-96wp-fq3f",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-wvj2-96wp-fq3f"
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},
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{
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"name": "https://github.com/modelcontextprotocol/go-sdk/commit/7b8d81c264074404abdf5aa16e2cf0c2d9c64cc0",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/modelcontextprotocol/go-sdk/commit/7b8d81c264074404abdf5aa16e2cf0c2d9c64cc0"
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}
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],
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"affected": [
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{
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"vendor": "modelcontextprotocol",
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"product": "go-sdk",
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"versions": [
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{
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"version": "< 1.3.1",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-02-26T00:47:46.967Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "The Go MCP SDK used Go's standard encoding/json.Unmarshal for JSON-RPC and MCP protocol message parsing in versions prior to 1.3.1. Go's standard library performs case-insensitive matching of JSON keys to struct field tags — a field tagged json:\"method\" would also match \"Method\", \"METHOD\", etc. This violated the JSON-RPC 2.0 specification, which defines exact field names. A malicious MCP peer may have been able to send protocol messages with non-standard field casing that the SDK would silently accept. This had the potential for bypassing intermediary inspection and coss-implementation inconsistency. Go's standard JSON unmarshaling was replaced with a case-sensitive decoder in commit 7b8d81c. Users are advised to update to v1.3.1 to resolve this issue."
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}
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],
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"source": {
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"advisory": "GHSA-wvj2-96wp-fq3f",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-02-26T17:06:14.973622Z",
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"id": "CVE-2026-27896",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-02-26T17:06:41.150Z"
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}
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},
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{
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"affected": [
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{
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"cpes": [
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"cpe:/a:redhat:migration_toolkit_virtualization:2"
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],
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"defaultStatus": "affected",
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"packageName": "migration-toolkit-virtualization/mtv-cli-download-rhel9",
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"product": "Migration Toolkit for Virtualization",
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"vendor": "Red Hat"
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},
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{
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"cpes": [
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],
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"defaultStatus": "affected",
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"packageName": "mtv-candidate/mtv-api-rhel9",
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"product": "Migration Toolkit for Virtualization",
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"vendor": "Red Hat"
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"product": "Migration Toolkit for Virtualization",
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"vendor": "Red Hat"
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"cpes": [
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"cpe:/a:redhat:migration_toolkit_virtualization:2"
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],
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"defaultStatus": "affected",
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"packageName": "mtv-candidate/mtv-controller-rhel9",
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"product": "Migration Toolkit for Virtualization",
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"vendor": "Red Hat"
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"cpes": [
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"cpe:/a:redhat:migration_toolkit_virtualization:2"
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"defaultStatus": "affected",
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"packageName": "mtv-candidate/mtv-operator-bundle",
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"product": "Migration Toolkit for Virtualization",
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"vendor": "Red Hat"
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{
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"cpes": [
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"cpe:/a:redhat:openshift_lightspeed"
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],
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"defaultStatus": "affected",
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"packageName": "openshift-lightspeed/openshift-mcp-server-rhel9",
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"product": "OpenShift Lightspeed",
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"vendor": "Red Hat"
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},
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{
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"cpes": [
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"cpe:/a:redhat:serverless:1"
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],
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"defaultStatus": "affected",
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"packageName": "openshift-serverless-1/kn-client-kn-rhel9",
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"product": "OpenShift Serverless",
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"vendor": "Red Hat"
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},
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"cpes": [
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"cpe:/a:redhat:serverless:1"
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"defaultStatus": "affected",
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"packageName": "openshift-serverless-1/kn-plugin-func-func-util-rhel9",
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"product": "OpenShift Serverless",
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"vendor": "Red Hat"
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"cpes": [
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"cpe:/a:redhat:openshift_ai"
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"defaultStatus": "affected",
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"packageName": "rhoai/odh-dashboard-rhel9",
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"product": "Red Hat OpenShift AI (RHOAI)",
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"vendor": "Red Hat"
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"defaultStatus": "affected",
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"packageName": "rhoai/odh-mod-arch-gen-ai-rhel9",
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"packageName": "rhoai/odh-mod-arch-model-registry-rhel9",
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"descriptions": [
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{
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"lang": "en",
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"value": "A flaw was found in the Go MCP SDK. This issue occurs due to an improper handling of case sensitivity during JSON-RPC message parsing, specifically in the matching of JSON keys to struct field tags. This behavior violates the JSON-RPC 2.0 specification, which explicitly requires case-sensitive field name matching. A malicious MCP peer able to send protocol messages with non-standard field casing can potentially bypass intermediary inspection, allowing attackers to smuggle payloads past upstream filters and cause cross-implementation inconsistency."
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "NETWORK",
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"availabilityImpact": "NONE",
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"baseScore": 7.2,
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"confidentialityImpact": "LOW",
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"integrityImpact": "LOW",
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"time": "2026-02-26T01:01:38.878Z",
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"value": "Reported to Red Hat."
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"time": "2026-02-26T00:47:46.967Z",
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"value": "Made public."
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],
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"title": "modelcontextprotocol/go-sdk: improper handling of case sensitivity",
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{
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"lang": "en",
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"value": "To mitigate this flaw, strictly enforce JSON-RPC case sensitivity before payload processing or harden upstream WAF and proxy rules to explicitly block improperly cased requests at the network edge."
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}
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} |