CVE-2026-6019 (GCVE-0-2026-6019)

Vulnerability from cvelistv5 – Published: 2026-04-22 19:28 – Updated: 2026-06-10 18:58
VLAI
Title
BaseCookie.js_output() does not neutralize embedded characters
Summary
http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
Severity
2.1 (Low)
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 20:02 UTC
CWE
  • CWE-150 - Improper neutralization of escape, meta, or control sequences
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 , < 3.13.14 (python)
Affected: 3.14.0a1 , < 3.14.5rc1 (python)
Affected: 3.15.0a1 , < 3.15.0b1 (python)
guessed Create a notification for this product.
Credits
oolongeya (https://github.com/komi22) Seth Larson (https://github.com/sethmlarson)
Show details on NVD website
To clipboard 

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                  "description": "CWE-150 Improper neutralization of escape, meta, or control sequences",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-04-29T15:31:09.049Z",
            "orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
            "shortName": "PSF"
          },
          "references": [
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/pull/148848"
            },
            {
              "tags": [
                "issue-tracking"
              ],
              "url": "https://github.com/python/cpython/issues/90309"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "BaseCookie.js_output() does not neutralize embedded characters",
          "x_generator": {
            "engine": "Vulnogram 0.6.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
        "assignerShortName": "PSF",
        "cveId": "CVE-2026-6019",
        "datePublished": "2026-04-22T19:28:08.720Z",
        "dateReserved": "2026-04-09T15:35:00.668Z",
        "dateUpdated": "2026-04-29T15:31:09.049Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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