CVE-2026-70463 (GCVE-0-2026-70463)

Vulnerability from cvelistv5 – Published: 2026-08-13 14:42 – Updated: 2026-08-14 18:09
VLAI
Title
rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing
Summary
rsync 3.1.0 before 3.5.0 contains an authorization bypass in auth users directive parsing. The auth users parser uses comma-only tokenization when splitting the user list, which fails to correctly handle entries of the form @Group Name where the group name contains a space. The space within the group name causes the parser to split the entry at the space boundary, discarding the deny rule associated with the group. An authenticated user whose username or group membership would be denied by an @Group Name auth users entry can connect to a restricted module because the deny rule is silently discarded during parsing.
Severity
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 18:03 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6753 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
RsyncProject rsync Affected: 3.1.0 , ≤ 3.4.4 (semver)
Unaffected: 3.5.0 (semver)
    cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-12 00:00
Credits
4drez
Show details on NVD website
To clipboard 

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            "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
            "shortName": "VulnCheck"
          },
          "references": [
            {
              "name": "GitHub Security Advisory (GHSA-pfj8-79vq-xgvr)",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-pfj8-79vq-xgvr"
            },
            {
              "name": "rsync 3.5.0 Release Notes",
              "tags": [
                "release-notes"
              ],
              "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://www.vulncheck.com/advisories/rsync-authorization-bypass-via-auth-users-directive-parsing"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "rsync 3.1.0 \u003c 3.5.0 Authorization Bypass via auth users Directive Parsing",
          "x_generator": {
            "engine": "Vulnogram 1.0.4"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "assignerShortName": "VulnCheck",
        "cveId": "CVE-2026-70463",
        "datePublished": "2026-08-13T14:42:07.126Z",
        "dateReserved": "2026-08-04T14:52:23.815Z",
        "dateUpdated": "2026-08-14T18:09:40.113Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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