Advisory severityHigh8.2Red Hat Linux

High [CVE-2026-71191] S3API presigned URL unsigned header authorization bypass

This high-severity Red Hat Linux advisory covers CVE-2026-71191.

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

CVE-2026-71191 Source published Jul 28, 2026Source updated Jul 28, 2026

VulniPulse record published Aug 6, 2026Record updated Aug 11, 2026

CVE-2026-71191

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Summary

S3API presigned URL unsigned header authorization bypass. Red Hat rates this important (CVSS 8.2).

Weakness: CWE-863.

Affected versions

2.38.0

Official advisory · high-confidence parse· fetched 2 months 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 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

If S3 API compatibility is not required, remove the s3api filter from the proxy-server pipeline in proxy-server.conf. This completely eliminates the attack surface. If S3 API is required, restrict the distribution and scope of presigned PUT URLs as an operational control, and apply the upstream patch when available. There is no configuration-only workaround that fully mitigates this issue while keeping S3 API functionality enabled.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Discussion(0)

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