CVE-2026-18503 (GCVE-0-2026-18503)

Vulnerability from cvelistv5 – Published: 2026-08-10 13:45 – Updated: 2026-10-14 00:34
VLAI
Title
Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()
Summary
Attacker-controlled CSV samples can trigger super-linear regular-expression work during dialect sniffing and consume significant CPU when applications pass unbounded input to csv.Sniffer.sniff().
Severity
2.4 (Low)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 17:56 UTC
CWE
Assigner
PSF CNA under the mitre root
CNA scorecard B 80/100 over 27 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Python Software Foundation CPython Affected: 0 , < 3.10.21 (python)
Affected: 3.11.0 , < 3.11.16 (python)
Affected: 3.12.0 , < 3.12.14 (python)
Affected: 3.13.0 , < 3.13.15 (python)
Affected: 3.14.0 , < 3.14.7 (python)
Affected: 3.15.0a1 , < 3.15.0rc1 (python)
Affected: 3.16.0a1 , < 3.16.0 (python)
guessed Create a notification for this product.
Credits
Serhiy Storchaka (https://github.com/serhiy-storchaka) Jack Desert (https://github.com/jackdesert) Sean Gilligan (https://github.com/sg3-141-592) Seth Larson (https://github.com/sethmlarson)
Show details on NVD website
To clipboard 

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              "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/KQ7NBMCPAZJHRROQXJQE4GMXGLD5KHBS/"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/pull/153694"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/python/cpython/issues/98820"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/063d4555c94ef412c731527dbf30193327f2ee82"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/476fb09cdb0d73e645849d98c610e7e5697ce7c9"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/89f29c760c02774b099ddd6863268eb13fa3946a"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/b30c7fa9edd921a118f286e9f90f560777fa693b"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/b09a67a20c464f8288c9f9a6b9c7082a74560024"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/fd78b565d7c326f96ae903ab945b47f35d829cf4"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Super-linear CPU usage for unbounded input to csv.Sniffer.sniff()",
          "x_generator": {
            "engine": "cvelib 1.8.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "assignerShortName": "PSF",
        "cveId": "CVE-2026-18503",
        "datePublished": "2026-08-10T13:45:31.618Z",
        "dateReserved": "2026-07-31T16:35:42.902Z",
        "dateUpdated": "2026-10-14T00:34:46.583Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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