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Advisory severityHigh7.7Red Hat Linux

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 on RHEL 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-55874 Source published Source updated

VulniPulse record published Record updated

CVE-2026-55874
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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 on RHEL 9. Red Hat fixing advisory: RHSA-2026:68333.

Is CVE-2026-55874 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-55874 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-55874?

Upgrade to a fixed release named by Red Hat:

  • 4.34
  • cryostat/cryostat-storage-rhel9:4.2.0-22
  • RHSA-2026:68333

Confirm against the vendor advisory before you patch.

Affected versions
  • < 4.34

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Fixed versions
  • 4.34
  • cryostat/cryostat-storage-rhel9:4.2.0-22
  • RHSA-2026:68333

Official advisory · high-confidence parse· fetched 11 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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 11 days ago·verify at source

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