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CVE-2026-25536

MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.10.0 to 1.25.3, cross-client response data leak when a single McpServer/Server and transport instance is reused across multiple client connections, most commonly in stateless StreamableHTTPServerTransport deployments. This issue has been patched in version 1.26.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c45c020cea02d26b7182b209d3daeb1fad9d05f01d11591fa28a3f45d9329c63
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"typescript-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":">= 1.10.0, < 1.26.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/affected/0

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.6::el9"],"defaultStatus":"affected","packageName":"ansible-automation-platform-tech-preview/mcp-server-rhel9","product":"Red Hat Ansible Automation Platform 2.6","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1772196222","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/affected/0
cwe · 2 assertions

{"cweId":"CWE-367","description":"Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"product":"typescript-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":">= 1.10.0, < 1.26.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/affected/0
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:ansible_automation_platform:2.6::el9"],"defaultStatus":"affected","packageName":"ansible-automation-platform-tech-preview/mcp-server-rhel9","product":"Red Hat Ansible Automation Platform 2.6","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1772196222","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-367","description":"Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-362","description":"CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:3960"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-25536"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/references/0
{"name":"RHBZ#2436937","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2436937"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/adp/1/references/1
{"name":"https://github.com/modelcontextprotocol/typescript-sdk/issues/204","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/typescript-sdk/issues/204"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/references/1
{"name":"https://github.com/modelcontextprotocol/typescript-sdk/issues/243","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/typescript-sdk/issues/243"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/references/2
{"name":"https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25536.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d65f4283a3aa553b315a66cf28ebab645a3e7e0d204dbd3fc1850da74ca7eb10 · sha256:29f9cf91a27cb7b3… · /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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