Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-27896

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4cbe0d50615f9434f2cf6e496a2cd7754120024ce444b80b577b23d5f476c558
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 12 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-controller-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/3

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"migration-toolkit-virtualization/mtv-cli-download-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/0

{"product":"go-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":"< 1.3.1"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-mod-arch-gen-ai-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/9

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-operator-bundle","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/4

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:serverless:1"],"defaultStatus":"affected","packageName":"openshift-serverless-1/kn-plugin-func-func-util-rhel9","product":"OpenShift Serverless","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/7

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:serverless:1"],"defaultStatus":"affected","packageName":"openshift-serverless-1/kn-client-kn-rhel9","product":"OpenShift Serverless","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/6

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-api-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_lightspeed"],"defaultStatus":"affected","packageName":"openshift-lightspeed/openshift-mcp-server-rhel9","product":"OpenShift Lightspeed","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/5

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-cli-download-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/2

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-dashboard-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/8

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-mod-arch-model-registry-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/10
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/metrics/1/cvssV3_1
cwe · 3 assertions

{"cweId":"CWE-178","description":"CWE-178: Improper Handling of Case Sensitivity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-178","description":"Improper Handling of Case Sensitivity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/problemTypes/0/descriptions/0

Affected products and versions

12 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-controller-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/3
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"migration-toolkit-virtualization/mtv-cli-download-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/0
{"product":"go-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":"< 1.3.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-mod-arch-gen-ai-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/9
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-operator-bundle","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/4
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:serverless:1"],"defaultStatus":"affected","packageName":"openshift-serverless-1/kn-plugin-func-func-util-rhel9","product":"OpenShift Serverless","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/7
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:serverless:1"],"defaultStatus":"affected","packageName":"openshift-serverless-1/kn-client-kn-rhel9","product":"OpenShift Serverless","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/6
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-api-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_lightspeed"],"defaultStatus":"affected","packageName":"openshift-lightspeed/openshift-mcp-server-rhel9","product":"OpenShift Lightspeed","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/5
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:migration_toolkit_virtualization:2"],"defaultStatus":"affected","packageName":"mtv-candidate/mtv-cli-download-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/2
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-dashboard-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/8
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"affected","packageName":"rhoai/odh-mod-arch-model-registry-rhel9","product":"Red Hat OpenShift AI (RHOAI)","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/affected/10

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/metrics/1/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-178","description":"CWE-178: Improper Handling of Case Sensitivity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-178","description":"Improper Handling of Case Sensitivity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-27896"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/references/0
{"name":"RHBZ#2442903","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2442903"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/references/1
{"name":"https://github.com/modelcontextprotocol/go-sdk/commit/7b8d81c264074404abdf5aa16e2cf0c2d9c64cc0","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/go-sdk/commit/7b8d81c264074404abdf5aa16e2cf0c2d9c64cc0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/references/1
{"name":"https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-wvj2-96wp-fq3f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-wvj2-96wp-fq3f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27896.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c858456d499d12a442547a7bd82f3bc30ff503bc8496a3717e4c56abf801d40 · sha256:0eae32adf707e59b… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

← Back to CVE Explorer