{"answers":{"affected":"2 open source packages ship an affected version, including rustfs. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-27607 in the wild and no public exploit code.","fix":"Upgrade rustfs to 1.0.0-alpha.83 or later.","what":"CVE-2026-27607 is a high-severity missing authorization vulnerability in rustfs, published on 25 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-27607 and fix it if it is affected.\n\nWhat it is: CVE-2026-27607 is a high-severity missing authorization vulnerability in rustfs, published on 25 Feb 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-2026-27607 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- rustfs (crates.io): affected from 1.0.0-alpha.56; fixed in 1.0.0-alpha.83\n- rustfs (crates.io): affected from 1.0.0-alpha.56; fixed in 1.0.0-alpha.83\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-2026-27607/ (Markdown: https://insights.sbomify.com/CVE-2026-27607/index.md)","id":"CVE-2026-27607","markdown":"https://insights.sbomify.com/CVE-2026-27607/index.md","name":"CVE-2026-27607","record":{"aliases":["GHSA-w5fh-f8xh-5x3p"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Distributed object storage","requires_auth":"low_privilege","summary":"Attackers can bypass upload policy restrictions to write arbitrary objects, spoof content types, and exhaust storage in RustFS object storage systems.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"rustfs","vendor":"rustfs"}],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypasses. Version 1.0.0-alpha.83 fixes the issue.","ecosystems":["crates.io"],"exploits":{"exploitdb":0,"first_seen":"2026-02-24","github_poc":1,"max_poc_stars":1,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-02-24T09:34:26Z","kind":"github_poc","ref":"https://github.com/nikeee/CVE-2026-27607","stars":1,"title":"Missing post-policy validation in RustFS"}],"tier":"poc_unverified"},"has_fix":true,"headline":"RustFS's Missing Post Policy Validation leads to Arbitrary Object Write","id":"CVE-2026-27607","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"Parse Dashboard Missing Authorization on Agent Endpoint","id":"CVE-2026-27608"},"packages":[{"ecosystem":"crates.io","fixed":["1.0.0-alpha.83"],"introduced":["1.0.0-alpha.56"],"last_affected":[],"package":"rustfs","purl":null,"source":"GHSA-w5fh-f8xh-5x3p"},{"ecosystem":"crates.io","fixed":["1.0.0-alpha.83"],"introduced":["1.0.0-alpha.56"],"last_affected":[],"package":"rustfs","purl":"pkg:cargo/rustfs","source":"GHSA-w5fh-f8xh-5x3p"}],"prev":{"headline":"Rollup 4 has Arbitrary File Write via Path Traversal","id":"CVE-2026-27606"},"products":["rustfs"],"published":"2026-02-25","related":[{"cvss_score":9.8,"headline":"RustFS has a gRPC Hardcoded Token Authentication Bypass","id":"CVE-2025-68926","kev_date_added":null,"published":"2025-12-30"},{"cvss_score":9.1,"headline":"Rust has Critical Stored XSS in Preview Modal, leading to Administrative Account Takeover","id":"CVE-2026-27822","kev_date_added":null,"published":"2026-02-25"},{"cvss_score":8.8,"headline":"RustFS Path Traversal Vulnerability","id":"CVE-2025-68705","kev_date_added":null,"published":"2026-01-07"},{"cvss_score":8.3,"headline":"RustFS: Missing admin authorization on notification target endpoints allows unauthenticated configuration of event webhooks","id":"CVE-2026-40937","kev_date_added":null,"published":"2026-04-22"},{"cvss_score":7.7,"headline":"RustFS sourceIp bypass via spoofed X-Forwarded-For/Real-IP headers","id":"CVE-2026-21862","kev_date_added":null,"published":"2026-02-03"},{"cvss_score":6.9,"headline":"RustFS Logs Sensitive Credentials in Plaintext","id":"CVE-2026-24762","kev_date_added":null,"published":"2026-02-03"}],"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":"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-02-25","vendors":["rustfs"]},"summary":"Attackers can bypass upload policy restrictions to write arbitrary objects, spoof content types, and exhaust storage in RustFS object storage systems.","url":"https://insights.sbomify.com/CVE-2026-27607/"}