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Vulnerability details: VCID-vk3a-td8w-ebfp
Vulnerability ID VCID-vk3a-td8w-ebfp
Aliases CVE-2026-6019
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.
Status Published
Exploitability 0.5
Weighted Severity 6.1
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-150 Improper Neutralization of Escape, Meta, or Control Sequences
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
System Score Found at
cvssv3 6.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-6019.json
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2026-6019
epss 0.00039 https://api.first.org/data/v1/epss?cve=CVE-2026-6019
epss 0.00051 https://api.first.org/data/v1/epss?cve=CVE-2026-6019
epss 0.00061 https://api.first.org/data/v1/epss?cve=CVE-2026-6019
epss 0.00061 https://api.first.org/data/v1/epss?cve=CVE-2026-6019
cvssv3.1 3.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv4 2.1 https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c
ssvc Track https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c
cvssv4 2.1 https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104
ssvc Track https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104
cvssv4 2.1 https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8
ssvc Track https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8
cvssv4 2.1 https://github.com/python/cpython/issues/90309
ssvc Track https://github.com/python/cpython/issues/90309
cvssv4 2.1 https://github.com/python/cpython/pull/148848
ssvc Track https://github.com/python/cpython/pull/148848
cvssv4 2.1 https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/
ssvc Track https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-6019.json
https://api.first.org/data/v1/epss?cve=CVE-2026-6019
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6019
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1135116 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1135116
148848 https://github.com/python/cpython/pull/148848
2460869 https://bugzilla.redhat.com/show_bug.cgi?id=2460869
3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c
76b3923d688c0efc580658476c5f525ec8735104 https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104
90309 https://github.com/python/cpython/issues/90309
f795e042043dfe26c42e1971d4502c1cdc4c65b8 https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8
IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3 https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-6019.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

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none

required

unchanged

changed

high

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none

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low

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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none

required

unchanged

changed

high

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none

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Vector: 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 Found at https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

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passive

active

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-22T20:02:17Z/ Found at https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c
Vector: 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 Found at https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

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passive

active

high

low

none

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none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-22T20:02:17Z/ Found at https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104
Vector: 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 Found at https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

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low

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-22T20:02:17Z/ Found at https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8
Vector: 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 Found at https://github.com/python/cpython/issues/90309
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-22T20:02:17Z/ Found at https://github.com/python/cpython/issues/90309
Vector: 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 Found at https://github.com/python/cpython/pull/148848
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

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low

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none

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low

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low

none

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low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-22T20:02:17Z/ Found at https://github.com/python/cpython/pull/148848
Vector: 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 Found at https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

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none

passive

active

high

low

none

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-22T20:02:17Z/ Found at https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/
Exploit Prediction Scoring System (EPSS)
Percentile 0.11642
EPSS Score 0.00039
Published At April 24, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-23T01:20:16.847348+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/6xxx/CVE-2026-6019.json 38.4.0