{"answers":{"affected":"3 open source packages ship an affected version, including github.com/fleetdm/fleet/v4. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-34388 in the wild and no public exploit code.","fix":"Upgrade github.com/fleetdm/fleet/v4 to 4.81.0 or later.","what":"CVE-2026-34388 is a medium-severity denial of service vulnerability in fleetdm fleet, published on 27 Mar 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-2026-34388 and fix it if it is affected.\n\nWhat it is: CVE-2026-34388 is a medium-severity denial of service vulnerability in fleetdm fleet, published on 27 Mar 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-2026-34388 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/fleetdm/fleet/v4 (Go): affected all versions; fixed in 4.81.0\n- github.com/fleetdm/fleet/v4 (Go): affected all versions; fixed in 4.81.0\n- github.com/fleetdm/fleet/v4 (Go): affected all versions; fixed in 4.81.0\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-2026-34388/ (Markdown: https://insights.sbomify.com/CVE-2026-34388/index.md)","id":"CVE-2026-34388","markdown":"https://insights.sbomify.com/CVE-2026-34388/index.md","name":"CVE-2026-34388","record":{"aliases":["GHSA-w254-4hp5-7cvv","GO-2026-4915"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Device management software","requires_auth":"none","summary":"An authenticated host can crash the Fleet server by sending an unexpected log type, disrupting all connected devices and services.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fleet","vendor":"fleetdm"}],"cvss":{"score":6.6,"severity":"medium","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/E:U","version":"4.0"},"cwes":[{"id":"CWE-703","name":"Improper Check or Handling of Exceptional Conditions"}],"description":"Fleet is open source device management software. Prior to 4.81.0, a denial-of-service vulnerability in Fleet's gRPC Launcher endpoint allows an authenticated host to crash the entire Fleet server process by sending an unexpected log type value. The server terminates immediately, disrupting all connected hosts, MDM enrollments, and API consumers. Version 4.81.0 patches the issue.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Fleet vulnerable to Denial of Service via unhandled gRPC log type in launcher endpoint","id":"CVE-2026-34388","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"Fleet's user account creation via invite does not enforce invited email address","id":"CVE-2026-34389"},"packages":[{"ecosystem":"Go","fixed":["4.81.0"],"introduced":["0"],"last_affected":[],"package":"github.com/fleetdm/fleet/v4","purl":null,"source":"GHSA-w254-4hp5-7cvv"},{"ecosystem":"Go","fixed":["4.81.0"],"introduced":["0"],"last_affected":[],"package":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","source":"GHSA-w254-4hp5-7cvv"},{"ecosystem":"Go","fixed":["4.81.0"],"introduced":["0"],"last_affected":[],"package":"github.com/fleetdm/fleet/v4","purl":"pkg:golang/github.com/fleetdm/fleet/v4","source":"GO-2026-4915"}],"prev":{"headline":"Fleet vulnerable to OS command injection via crafted software package metadata in uninstall scripts","id":"CVE-2026-34387"},"products":["fleet"],"published":"2026-03-27","related":[{"cvss_score":10,"headline":"SAML authentication vulnerability in Fleet","id":"CVE-2020-26276","kev_date_added":null,"published":"2020-12-17"},{"cvss_score":9.3,"headline":"Fleet before 4.87.0 Authentication Bypass via Device Identifiers","id":"CVE-2026-103264","kev_date_added":null,"published":"2026-10-01"},{"cvss_score":9.3,"headline":"Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment","id":"CVE-2026-23518","kev_date_added":null,"published":"2026-01-21"},{"cvss_score":8.7,"headline":"Fleet server may terminate unexpectedly when handling certain gRPC requests","id":"CVE-2026-26062","kev_date_added":null,"published":"2026-05-14"},{"cvss_score":8.7,"headline":"Fleet's unbounded request body read allows remote Denial of Service","id":"CVE-2026-26061","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":8.2,"headline":"Fleet has a Windows MDM management endpoint authentication bypass","id":"CVE-2026-23998","kev_date_added":null,"published":"2026-05-14"},{"cvss_score":8.2,"headline":"Fleet Windows MDM Azure AD JWT Authentication Bypass","id":"CVE-2026-24899","kev_date_added":null,"published":"2026-05-14"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-31","vendors":["fleetdm"]},"summary":"An authenticated host can crash the Fleet server by sending an unexpected log type, disrupting all connected devices and services.","url":"https://insights.sbomify.com/CVE-2026-34388/"}