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CVE-2026-34742

The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.0, the Model Context Protocol (MCP) Go SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPHandler or SSEHandler, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resource
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d4c909a7c07daea2d70e28fe501959818e26f6c4bc85760b093ef1cc34756ea9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 11 assertions

{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/2

{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/8

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"unaffected","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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /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":"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/1

{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/5

{"product":"go-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":"< 1.4.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/affected/0

{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /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-client-kn-rhel9","product":"OpenShift Serverless","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/7

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

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/6

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:openshift_devspaces:3.28::el9"],"defaultStatus":"affected","packageName":"devspaces/udi-rhel9","product":"Red Hat OpenShift Dev Spaces 3.28","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1779829736","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/0

{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/3
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7.6,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/metrics/1/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-1188","description":"Initialization of a Resource with an Insecure Default","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-1188","description":"CWE-1188: Insecure Default Initialization of Resource","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

11 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-api-rhel9","product":"Migration Toolkit for Virtualization","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/2
{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/8
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_ai"],"defaultStatus":"unaffected","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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /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":"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/1
{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/5
{"product":"go-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":"< 1.4.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/affected/0
{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /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-client-kn-rhel9","product":"OpenShift Serverless","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/7
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift_lightspeed"],"defaultStatus":"unaffected","packageName":"openshift-lightspeed/openshift-mcp-server-rhel9","product":"OpenShift Lightspeed","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/6
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:openshift_devspaces:3.28::el9"],"defaultStatus":"affected","packageName":"devspaces/udi-rhel9","product":"Red Hat OpenShift Dev Spaces 3.28","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1779829736","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/0
{"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:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/affected/3

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7.6,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/metrics/1/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-1188","description":"Initialization of a Resource with an Insecure Default","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-1188","description":"CWE-1188: Insecure Default Initialization of Resource","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/problemTypes/0/descriptions/0

Source references

8 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:21772"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-34742"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/references/0
{"name":"RHBZ#2454608","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2454608"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/adp/1/references/1
{"name":"https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/go-sdk/commit/67bd3f2e2b53ce11a16db8d976cdb8ff1e986b6d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/references/2
{"name":"https://github.com/modelcontextprotocol/go-sdk/pull/760","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/go-sdk/pull/760"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/references/1
{"name":"https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/go-sdk/releases/tag/v1.4.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/references/3
{"name":"https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-xw59-hvm2-8pj6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-xw59-hvm2-8pj6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34742.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b08f75c2bc420080867d8f882b14463a5cab3c07281a66897537b072df31548b · sha256:9562b80f4a3e88e8… · /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.

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