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Vulnerability · Published Nov 5, 2026 · Assigned by GitHub_M

CVE-2026-58273Rucio: Authorisation Bypass on REST API endpoint for signing URLs

High 8.1

In plain English

A high-severity authorization bypass via user-controlled key in rucio from rucio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.6%top 53.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

Rucio is a scientific data management framework. From 1.16.1 until 35.9.0, 38.6.0, and 41.0.0rc1, the /credentials/signurl endpoint reads X-Rucio-Account instead of the account stored in request.environ['issuer'] by token authentication. Any authenticated low-privilege user can supply root as the header value and pass the root-only get_signed_url permission check. The server then returns a presigned read, write, or delete URL for an attacker-selected object using stored S3, GCS, or Swift credentials, and X-Rucio-VO can select another tenant in multi-VO deployments. This permits data disclosure, modification, deletion, and cross-tenant access on cloud-backed RSEs. This issue is fixed in versions 35.9.0, 38.6.0, and 41.0.0rc1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIrucio35.9.0GHSA-5j9r-fx4x-rpvg
PyPIrucio38.6.0GHSA-5j9r-fx4x-rpvg
PyPIrucio41.0.0rc1GHSA-5j9r-fx4x-rpvg

Affected products (as reported)

VendorProductVersions
rucio rucio >= 1.16.1, < 35.9.0>= 36.0.0, < 38.6.0>= 39.0.0, < 41.0.0rc1

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References