Medium [CVE-2026-79780] Information disclosure via S3 redirect callbacks
This medium-severity Red Hat Linux advisory covers CVE-2026-79780 affecting Cryostat 4, Red Hat Advanced Cluster Management for Kubernetes 2.
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Summary
rclone before v1.75.0 fails to sanitize IBM IAM bearer tokens and SSE-C encryption keys during S3 redirect callbacks, allowing credentials to be preserved across scheme or host changes.
Attackers observing network traffic from a trusted endpoint can capture reusable IBM IAM tokens on same-host HTTPS-to-HTTP downgrades or SSE-C keys on cross-origin redirects to access protected S3 objects. A flaw was found in rclone.
When rclone interacts with S3 endpoints that issue unsafe redirects, an adjacent network attacker can capture these credentials during HTTPS-to-HTTP downgrades or cross-origin redirects. The impact is constrained by the scope of the captured token and the attacker's access to encrypted objects.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N). Weakness: CWE-201.
Affected Red Hat products: Cryostat 4; Red Hat Advanced Cluster Management for Kubernetes 2. Red Hat does not currently list a fixing RHSA for this CVE.
- < 75.0
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation checklist
- Until packages are updated, avoid using rclone S3 remotes with IBM IAM bearer tokens or SSE-C customer-provided keys against endpoints or gateways that issue cross-scheme or cross-host redirects. Prefer trusted HTTPS endpoints that do not downgrade or redirect secret-bearing requests.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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