CVE-2025-13836 (GCVE-0-2025-13836)

Vulnerability from cvelistv5 – Published: 2025-12-01 18:02 – Updated: 2026-03-03 14:41
VLAI
Title
Excessive read buffering DoS in http.client
Summary
When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-01 18:32 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
PSF CNA under the mitre root
CNA scorecard B 80/100 over 26 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Python Software Foundation CPython Affected: 0 , < 3.10.20 (python)
Affected: 3.11.0 , < 3.11.15 (python)
Affected: 3.12.0 , < 3.12.13 (python)
Affected: 3.13.0 , < 3.13.11 (python)
Affected: 3.14.0 , < 3.14.1 (python)
Affected: 3.15.0a1 , < 3.15.0a3 (python)
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                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "exploitMaturity": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "LOW",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-03-03T14:41:48.702Z",
            "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
            "shortName": "PSF"
          },
          "references": [
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              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/python/cpython/issues/119451"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/pull/119454"
            },
            {
              "tags": [
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              ],
              "url": "https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155"
            },
            {
              "tags": [
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              ],
              "url": "https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15"
            },
            {
              "tags": [
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              ],
              "url": "https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628"
            },
            {
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              ],
              "url": "https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0"
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              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587c"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Excessive read buffering DoS in http.client",
          "x_generator": {
            "engine": "Vulnogram 0.5.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "assignerShortName": "PSF",
        "cveId": "CVE-2025-13836",
        "datePublished": "2025-12-01T18:02:38.483Z",
        "dateReserved": "2025-12-01T17:54:40.759Z",
        "dateUpdated": "2026-03-03T14:41:48.702Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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