{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-19820 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-19820 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-19820 is a medium-severity path traversal vulnerability in Backblaze Client, published on 1 Sep 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-2026-19820 and fix it if it is affected.\n\nWhat it is: CVE-2026-19820 is a medium-severity path traversal vulnerability in Backblaze Client, published on 1 Sep 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-2026-19820 in the wild and no public exploit code.\n\nAffected product: Backblaze Client. 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-2026-19820/ (Markdown: https://insights.sbomify.com/CVE-2026-19820/index.md)","id":"CVE-2026-19820","markdown":"https://insights.sbomify.com/CVE-2026-19820/index.md","name":"CVE-2026-19820","record":{"aliases":["GHSA-wf7j-r93f-5cvm"],"analysis":{"component_type":"desktop_application","fix_type":"no_fix_stated","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"Backblaze Client","requires_auth":"none","summary":"A local attacker can render the system unbootable by exploiting improper link resolution during backup, requiring specific administrative configuration changes.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Bugcrowd","cpe":[],"cvss":{"score":5.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:L","version":"4.0"},"cwes":[{"id":"CWE-59","name":"Improper Link Resolution Before File Access"}],"description":"A vulnerability in the Backblaze Client allows a local user to make the system not bootable by creating a link from Backblaze's folder to Windows OS system files during a backup. Successful exploitation requires an administrator-level system change that results in the absence of specific Windows OS security controls. This vulnerability is due to improper link resolution.","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":"Backblaze Client for Windows Improper Link Resolution Vulnerability","id":"CVE-2026-19820","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Tenda AC12 httpd web management interface SetSysAutoRebbotCfg formSetRebootTimer buffer overflow","id":"CVE-2026-19821"},"packages":[],"prev":{"headline":"PackageKit: dnf5 backend ignores SIMULATE on RepoRemove","id":"CVE-2026-19816"},"products":["Backblaze Client"],"published":"2026-09-01","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":"2026-09-10","vendors":["Backblaze"]},"summary":"A local attacker can render the system unbootable by exploiting improper link resolution during backup, requiring specific administrative configuration changes.","url":"https://insights.sbomify.com/CVE-2026-19820/"}