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NVD / CVE Program· CNA PSF

CVE-2026-6019: BaseCookie.js_output() does not neutralize embedded characters

Noroxi assessment

Priority: Monitor (action score 8/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Python Software Foundation CPython 3.13.14, 3.14.5rc1, 3.15.0b1; azl3 python-py 1.11.0-1 on Azure Linux 3.0 Release Notes; azl3 python3 3.12.14-2 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to Python Software Foundation CPython 3.13.14, 3.14.5rc1, 3.15.0b1; azl3 python-py 1.11.0-1 on Azure Linux 3.0 Release Notes; azl3 python3 3.12.14-2 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

LowCVSS 2.1 · v4.0—No exploit Fix available
Published
Apr 22, 2026
Updated
Oct 26, 2026
EPSS
0.2% · 11th percentile

Report tools

JSON

Action score

8

Monitor

Low priority for now.

CVSS
8 / 40 · 2.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · PSF
2.1
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-6019

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
pythonpython

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • python pythonbefore 3.13.14
  • python python3.14.0 and later · up to 3.14.4 inclusive
  • python python3.15.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (PSF). Independent of NVD's CPE analysis and usually ahead of it.

  • Python Software Foundation CPython

    • before 3.13.14affected · python
    • 3.14.0a1 and later · before 3.14.5rc1affected · python
    • 3.15.0a1 and later · before 3.15.0b1affected · python

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10python3.14before 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-debugbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-develbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-freethreadingbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-freethreading-debugbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-freethreading-develbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-freethreading-idlebefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-freethreading-libsbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-freethreading-testbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-freethreading-tkinterbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-idlebefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-libsbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-testbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:10python3.14-tkinterbefore 3.14.5-1.el10_23.14.5-1.el10_2
AlmaLinux:9python3.14before 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-debugbefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-develbefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-freethreadingbefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-freethreading-debugbefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-freethreading-develbefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-freethreading-idlebefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-freethreading-libsbefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-freethreading-testbefore 3.14.5-1.el9_83.14.5-1.el9_8
AlmaLinux:9python3.14-freethreading-tkinterbefore 3.14.5-1.el9_83.14.5-1.el9_8

+96

Same product

python: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-5636Integer overflow in the get_data function in zipimport.c in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 all
    47Plan
  • CVE-2007-4559Directory traversal vulnerability in the (1) extract and (2) extractall functions in the tarfile module in Python allows user-assisted remot
    47Plan
  • CVE-2021-3177Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Pyth
    46Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-4224Mar 16, 2026 · Stack overflow parsing XML with deeply nested DTD content models
    24Monitor
  • ← EarlierCVE-2026-4519Mar 20, 2026 · webbrowser.open() allows leading dashes in URLs
    28Monitor
  • Later →CVE-2026-3087Apr 27, 2026 · shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs
    24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Python Software Foundation CPython3.13.14Vendor (CNA)
Python Software Foundation CPython3.14.5rc1Vendor (CNA)
Python Software Foundation CPython3.15.0b1Vendor (CNA)
azl3 python-py 1.11.0-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 python3 3.12.14-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 python3 3.12.14-2 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
cbl2 python3 3.9.19-19 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
almalinux:python3.143.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-debug3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-devel3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-freethreading3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-freethreading-debug3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-freethreading-devel3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-freethreading-idle3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-freethreading-libs3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-freethreading-test3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-freethreading-tkinter3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-idle3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:python3.14-libs3.14.5-1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:python3.113.11.2-6+deb12u9 · Debian:12Package registry (OSV)
debian:python3.133.13.5-2+deb13u2 · Debian:13Package registry (OSV)
debian:python3.143.14.5~rc1-1 · Debian:14Package registry (OSV)
opensuse:python33.13.14-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python3103.10.20-6.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3113.11.15-6.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3123.12.13-6.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python3133.13.13-2.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:python313-core3.13.14-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python313-documentation3.13.14-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python313-nogil3.13.14-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)

+37

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
X

Weakness class (CWE)

CWE-150 · Improper Neutralization of Escape, Meta, or Control Sequences

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records