High [CVE-2026-55874] Information disclosure via S3 API gateway path traversal
This high-severity Red Hat Linux advisory covers CVE-2026-55874 affecting Cryostat 4.
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Summary
SeaweedFS is a distributed storage system. Prior to 4.34, the S3 API gateway does not reject dot-dot path segments in the X-Amz-Copy-Source header used by CopyObject and UploadPartCopy, allowing an authenticated identity scoped to one bucket to read objects from other buckets through server-side copy.
This issue is fixed in version 4.34. The vulnerability results in unauthorized information disclosure across storage buckets.
Important: This flaw in SeaweedFS allows an authenticated attacker to bypass intended access controls within the S3 API gateway. This could lead to unauthorized information disclosure in Red Hat Cryostat deployments utilizing SeaweedFS for storage.
Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N). Weakness: CWE-22.
Affected Red Hat products: Cryostat 4. Red Hat does not currently list a fixing RHSA for this CVE.
- < 4.34
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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