Low
BaseCookie.js_output() does not neutralize embedded characters
Type: advisorySources: OSV
http.cookies.Morsel.js_output() returns an inline inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-6019
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 15:55 UTC · Revision 1
Source evidence
BaseCookie.js_output() does not neutralize embedded characters
core-osv · Original sourcePublished 22 Apr 2026, 19:28 UTC
http.cookies.Morsel.js_output() returns an inline inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
osv:CVE-2026-6019
Complete source record
{
"id": "e54182f0507dad1f2081c2c44bfdf24a24e2ddaa0cd6def67c52375d39f1521d",
"url": "https://osv.dev/vulnerability/CVE-2026-6019",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "BaseCookie.js_output() does not neutralize embedded characters",
"summary": "http.cookies.Morsel.js_output() returns an inline inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.",
"evidence": "osv:CVE-2026-6019",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-6019",
"aliases": [
"BIT-libpython-2026-6019",
"BIT-python-2026-6019",
"BIT-python-min-2026-6019",
"CVE-2026-6019",
"PSF-2026-21"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/python/cpython",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "fd17997c3866d61e0e7bd8201b1d8f35b40a40bd"
},
{
"introduced": "ebf955df7a89ed0c7968f79faec1de49f61ed7cb"
},
{
"fixed": "3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c"
},
{
"fixed": "76b3923d688c0efc580658476c5f525ec8735104"
},
{
"fixed": "f795e042043dfe26c42e1971d4502c1cdc4c65b8"
}
],
"database_specific": {
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{
"cpe": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
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{
"fixed": "3.13.14"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:python:python:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.14.0"
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{
"last_affected": "3.14.4"
}
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"source": "CPE_RANGE"
},
{
"range": [
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"fixed": "3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c"
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],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "76b3923d688c0efc580658476c5f525ec8735104"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "f795e042043dfe26c42e1971d4502c1cdc4c65b8"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
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"v3.2rc2",
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"v3.2b2",
"v3.2b1",
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"v3.1",
"v3.1rc2",
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"v3.1b1",
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"v3.0rc3",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6019.json"
}
}
],
"modified": "2026-10-28T02:30:37.032457626Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6019.json",
"https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/",
"https://nvd.nist.gov/vuln/detail/CVE-2026-6019",
"https://github.com/python/cpython/issues/90309",
"https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c",
"https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104",
"https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8",
"https://github.com/python/cpython/pull/148848",
"https://github.com/python/cpython"
],
"provider_metadata": {
"cwe_ids": [
"CWE-150"
],
"cna_assigner": "PSF",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6019.json"
}
},
"related_cves": [
{
"value": "CVE-2026-6019",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 504321,
"published_at": "2026-04-22T19:28:08.72+00:00"
}