{"answers":{"affected":"5 open source packages ship an affected version, including github.com/cloudreve/Cloudreve/v4, github.com/cloudreve/Cloudreve and github.com/cloudreve/Cloudreve/v3.","exploited":"There is no known exploitation of CVE-2026-77633 in the wild and no public exploit code.","fix":"Upgrade github.com/cloudreve/Cloudreve/v4 to 4.0.0-20260715025621-7329602751c0 or later.","what":"CVE-2026-77633 is a high-severity vulnerability in cloudreve, 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-2026-77633 and fix it if it is affected.\n\nWhat it is: CVE-2026-77633 is a high-severity vulnerability in cloudreve, 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-2026-77633 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/cloudreve/Cloudreve/v4 (Go): affected all versions; fixed in 4.0.0-20260715025621-7329602751c0\n- github.com/cloudreve/Cloudreve/v4 (Go): affected all versions; fixed in 4.0.0-20260715025621-7329602751c0\n- github.com/cloudreve/Cloudreve/v4 (Go): affected all versions; fixed in 4.0.0-20260715025621-7329602751c0\n- github.com/cloudreve/Cloudreve (Go): affected all versions; no fix listed\n- github.com/cloudreve/Cloudreve/v3 (Go): affected all versions; no fix listed\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-2026-77633/ (Markdown: https://insights.sbomify.com/CVE-2026-77633/index.md)","id":"CVE-2026-77633","markdown":"https://insights.sbomify.com/CVE-2026-77633/index.md","name":"CVE-2026-77633","record":{"aliases":["GHSA-xj3h-wwxq-gfcj","GO-2026-6578"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["denial_of_service","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Cloudreve file manager","requires_auth":"low_privilege","summary":"Authenticated users can bypass storage quotas via race conditions, exhausting host storage and denying service to other users.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-367","name":"Time-of-check Time-of-use (TOCTOU) Race Condition"},{"id":"CWE-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"}],"description":"Cloudreve is a self-hosted file management and sharing system. Prior to 4.18.0, PrepareUpload in pkg/filemanager/fs/dbfs/upload.go checks a stale in-memory user storage value through validateUserCapacity and later applies an unconditional storage charge outside the same quota-enforcing transaction. An authenticated user with Files.Write permission can issue concurrent upload-session requests that read the same capacity snapshot, all pass the MaxStorage check, and reserve their declared sizes through CommitWithStorageDiff. The resulting reservations can exceed the account quota and can be materialized as chunked uploads that exhaust host storage and deny uploads to other users. The default local-storage policy and default User group are affected. This issue is fixed in version 4.18.0.","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":"Cloudreve: Storage-quota TOCTOU race allows quota bypass and storage-based denial of service","id":"CVE-2026-77633","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"race_condition","year":"2026"},"n_packages":5,"n_references":3,"next":{"headline":"CakePHP: SmtpTransport vulnerable to CRLF header injection","id":"CVE-2026-77634"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/cloudreve/Cloudreve","purl":"pkg:golang/github.com/cloudreve/Cloudreve","source":"GO-2026-6578"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/cloudreve/Cloudreve/v3","purl":"pkg:golang/github.com/cloudreve/Cloudreve/v3","source":"GO-2026-6578"},{"ecosystem":"Go","fixed":["4.0.0-20260715025621-7329602751c0"],"introduced":["0"],"last_affected":[],"package":"github.com/cloudreve/Cloudreve/v4","purl":null,"source":"GHSA-xj3h-wwxq-gfcj"},{"ecosystem":"Go","fixed":["4.0.0-20260715025621-7329602751c0"],"introduced":["0"],"last_affected":[],"package":"github.com/cloudreve/Cloudreve/v4","purl":"pkg:golang/github.com/cloudreve/Cloudreve/v4","source":"GHSA-xj3h-wwxq-gfcj"},{"ecosystem":"Go","fixed":["4.0.0-20260715025621-7329602751c0"],"introduced":["0"],"last_affected":[],"package":"github.com/cloudreve/Cloudreve/v4","purl":"pkg:golang/github.com/cloudreve/Cloudreve/v4","source":"GO-2026-6578"}],"prev":{"headline":"pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing","id":"CVE-2026-77630"},"products":["cloudreve"],"published":"2026-09-22","related":[],"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":"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":"2026-09-25","vendors":["cloudreve"]},"summary":"Authenticated users can bypass storage quotas via race conditions, exhausting host storage and denying service to other users.","url":"https://insights.sbomify.com/CVE-2026-77633/"}