{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-108859 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-108859 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-108859 is a high-severity denial of service vulnerability in mark3labs mcp-go, published on 11 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-108859 and fix it if it is affected.\n\nWhat it is: CVE-2026-108859 is a high-severity denial of service vulnerability in mark3labs mcp-go, published on 11 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-108859 in the wild and no public exploit code.\n\nAffected product: mark3labs mcp-go. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-108859/ (Markdown: https://insights.sbomify.com/CVE-2026-108859/index.md)","id":"CVE-2026-108859","markdown":"https://insights.sbomify.com/CVE-2026-108859/index.md","name":"CVE-2026-108859","record":{"aliases":["GHSA-c673-ppxx-9wvj"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go MCP library","requires_auth":"none","summary":"Remote attackers can exhaust server memory by sending oversized POST requests to the mcp-go library, causing denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"mcp-go through 1.2.1 contains a denial of service vulnerability in StreamableHTTPServer.ServeHTTP that allows remote unauthenticated attackers to exhaust memory by sending oversized POST bodies. Attackers can send arbitrarily large or many concurrent POST requests, read fully via io.ReadAll before validation, to degrade or OOM-kill the server process.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"mcp-go through 1.2.1 Denial of Service via Unbounded POST Body Buffering","id":"CVE-2026-108859","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"BotSharp through 5.2.0 Authentication Bypass via Hard-Coded JWT Signing Key","id":"CVE-2026-108860"},"packages":[],"prev":{"headline":"Predibase LoRAX through 0.12.1 API Token Exposure via Router Logs","id":"CVE-2026-108858"},"products":["mcp-go"],"published":"2026-10-11","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-18","vendors":["mark3labs"]},"summary":"Remote attackers can exhaust server memory by sending oversized POST requests to the mcp-go library, causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-108859/"}