{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "3.4.2"
              },
              {
                "last_affected": "3.4.4"
              },
              {
                "fixed": "3.5.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "de3cc03b03be153092f266aa1117b4706947ed07"
            },
            {
              "fixed": "471e17dc0d68233db84db11be82c9f62f4661214"
            }
          ],
          "repo": "https://github.com/rsyncproject/rsync",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rjvj-qgqg-cvx9"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70455.json"
  },
  "details": "rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N with a large value to spawn an unbounded number of Zstandard worker threads on the receiver, exhausting available thread and memory resources.",
  "id": "CVE-2026-70455",
  "modified": "2026-08-17T03:36:29.524109560Z",
  "published": "2026-08-13T14:45:11.164Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70455.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/RsyncProject/rsync/releases/tag/v3.5.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjvj-qgqg-cvx9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-70455"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/rsync-dos-via-zt-zstandard-compression-thread-exhaustion"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/RsyncProject/rsync"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "rsync 3.4.2 \u003c 3.5.0 DoS via --zt Zstandard Compression Thread Exhaustion"
}