{"schema":"threatline.record/2","record":{"id":"CVE-2026-97731","aliases":[],"summary":"MinIO through 7aac2a2 does not verify that every x-amz-* header present on a request also appears in the client-supplied X-Amz-SignedHeaders list. extractSignedHeaders() in cmd/signature-v4-utils.go i","details":"MinIO through 7aac2a2 does not verify that every x-amz-* header present on a request also appears in the client-supplied X-Amz-SignedHeaders list. extractSignedHeaders() in cmd/signature-v4-utils.go iterates only the claimed list and never enumerates the headers that actually arrived, and thus a header that arrives unsigned is neither hashed into the canonical request nor rejected. Because cmd/api-router.go dispatches CopyObject on the presence of x-amz-copy-source alone, the holder of a presigned PUT URL scoped to a single object can add that header to the unmodified URL and cause a server-side copy, executed as the signer, of any object the signing key can read. A grant to write one object becomes a read of every bucket that key can reach. Amazon S3 rejects the equivalent request with HTTP 403 AccessDenied. The minio/minio GitHub repository was archived in April 2026; pgsty/silo before 1233254 is also affected.","categories":["Unclassified"],"product":"MinIO","vendor":"MinIO","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97731","source_modified_at":"2026-09-25T15:22:53.901Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"MinIO","vendor":"MinIO","versions":[{"lessThanOrEqual":"7aac2a2c5b7c882e68c1ce017d8256be2feea27f","status":"affected","version":"0","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00167,"percentile":0.05687,"score_date":"2026-10-23"},"published_at":"2026-09-25T03:07:30.661Z","modified_at":"2026-09-25T15:22:53.901Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97731","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-25T15:22:53.901Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97731","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://silo.pgsty.com/about/security-advisories/#sn-2026-011"},{"source":"CVE List","url":"https://github.com/pgsty/silo/commit/1233254309b15571f101b2b26d531951ceaeef1e"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-25T15:22:42.586752Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-25T15:22:53.901Z","content_hash":"62e1f4e5da1f1a0e8e034c34b0102a4e950507ac072e9cc7f2fa9ba014fd8464"}}