{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-109399 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-109399 is a critical vulnerability in sbabic swupdate, published on 12 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-2026-109399 and fix it if it is affected.\n\nWhat it is: CVE-2026-109399 is a critical vulnerability in sbabic swupdate, published on 12 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-2026-109399 in the wild and no public exploit code.\n\nAffected product: sbabic swupdate. 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-2026-109399/ (Markdown: https://insights.sbomify.com/CVE-2026-109399/index.md)","id":"CVE-2026-109399","markdown":"https://insights.sbomify.com/CVE-2026-109399/index.md","name":"CVE-2026-109399","record":{"aliases":["DEBIAN-CVE-2026-109399","GHSA-xf8v-f779-856c","UBUNTU-CVE-2026-109399"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"SWUpdate firmware updater","requires_auth":"none","summary":"Attackers can bypass signature verification in SWUpdate to install malicious firmware updates by embedding untrusted intermediate certificates.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":9.2,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_openssl.c that trusts untrusted X.509 certificates embedded in CMS SignedData for chain building. Attackers holding a signing key from a sibling intermediate under the same root can embed that intermediate in the signature to install malicious updates.","ecosystems":[],"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":"SWUpdate through 2026.05.1 CMS Signature Verification Bypass via Embedded Intermediates","id":"CVE-2026-109399","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"Privilege escalation in InstaWP Connect – 1-click WP Staging \u0026 Migration","id":"CVE-2026-109400"},"packages":[],"prev":{"headline":"Gumlet php-image-resize before 3.0.1 Denial of Service via Decompression Bombs","id":"CVE-2026-109398"},"products":["swupdate"],"published":"2026-10-12","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":"total"},"state":"PUBLISHED","updated":"2026-10-18","vendors":["sbabic"]},"summary":"Attackers can bypass signature verification in SWUpdate to install malicious firmware updates by embedding untrusted intermediate certificates.","url":"https://insights.sbomify.com/CVE-2026-109399/"}