{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-90990 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-90990 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-90990 is a medium-severity vulnerability in Checkmk, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-90990 and fix it if it is affected.\n\nWhat it is: CVE-2026-90990 is a medium-severity vulnerability in Checkmk, published on 22 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-90990 in the wild and no public exploit code.\n\nAffected product: Checkmk. 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-2026-90990/ (Markdown: https://insights.sbomify.com/CVE-2026-90990/index.md)","id":"CVE-2026-90990","markdown":"https://insights.sbomify.com/CVE-2026-90990/index.md","name":"CVE-2026-90990","record":{"aliases":["GHSA-v742-5hjw-gqcp"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"IT monitoring software","requires_auth":"low_privilege","summary":"Authenticated users can inject Livestatus headers to bypass visibility restrictions and cause resource exhaustion in Checkmk monitoring systems.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Checkmk","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-93","name":"Improper Neutralization of CRLF Sequences"}],"description":"Improper neutralization of newlines in filter values in the monitoring host and service list APIs in Checkmk \u003c2.5.0p14 allows an authenticated user to inject additional Livestatus query headers, bypassing object visibility restrictions in count queries to infer information about hosts and services outside their contact groups and occupying web server and Livestatus workers for an attacker-controlled duration.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Livestatus injection via monitoring filter values","id":"CVE-2026-90990","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"other","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Langflow OSS is affected by multiple vulnerabilities","id":"CVE-2026-90991"},"packages":[],"prev":{"headline":"Tainacan \u003c 1.4.0 - Subscriber+ Repository Staff Email Address Disclosure via Reports REST Endpoints","id":"CVE-2026-90989"},"products":["Checkmk"],"published":"2026-09-22","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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-22","vendors":["Checkmk GmbH"]},"summary":"Authenticated users can inject Livestatus headers to bypass visibility restrictions and cause resource exhaustion in Checkmk monitoring systems.","url":"https://insights.sbomify.com/CVE-2026-90990/"}