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›vulnerability›CVE-2026-6019
Name
CVE-2026-6019
Source
NVD ( link)Debian ( link)
Description
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.
CWEs
CWE-150 CWE-116
Published Date
Updated Date
Workaround
-
Advisories
https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76cPatch
https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104Patch
https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8Patch
https://github.com/python/cpython/issues/90309Exploit
https://github.com/python/cpython/pull/148848Issue Tracking
https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/Mailing List

Analysis#

Affected Component
Analysis
python3
Exploitable

Vulnerability Ratings#

2.1
CVSSv4
6.1
CVSSv31
NaN
other

Others affected components#

Name
Project
Project Version
Version
Status
python3
buildroot
master
3.14.7
Not Affected
python3
openwrt
master
3.14.5-r2
Not Affected
python3
openwrt
openwrt-25.12
3.13.9-r3
Exploitable
python3
yocto
kirkstone
3.10.20
Exploitable
python3
yocto
master
3.14.7
Not Affected
python3
yocto
scarthgap
3.12.13
Patched

Resolved with patches#

python3 (yocto:scarthgap)

#
Title
Author
Resolve
1
[3.13] gh-149144: Use `decodeURIComponent()` for UTF-8
Stan Ulbrych <stan@python.org>
CVE-2026-6019
2
[3.13] gh-90309: Base64-encode cookie values embedded in
"Miss Islington (bot)"
CVE-2026-6019