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CVE-2026-97731

MinIO through 7aac2a2 does not verify that every x-amz-* header present on a request also appears in the client-supplied…

High7.1EPSS 0.17%
Published
Updated
Reserved
Assigned by
mitre

Description

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.

Timeline

  1. ID reserved

    By mitre

  2. Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-97731, by who scored it
Scored byCVSSScoreVector
mitreCNA (assigner)3.1High7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
NVDNVD · Awaiting Analysis3.1High7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
EPSS (exploitation in 30 days)
0.17% · top 94% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Weakness

Affected products

  • MinIO · MinIO

    • affected ≤ 7aac2a2c5b7c882e68c1ce017d8256be2feea27f

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .