Is CVE-2026-6019 in the CISA KEV catalog?

No. CVE-2026-6019 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-6019?

CVE-2026-6019 has a CVSS v3 base score of 6.1 (Low).

What is the EPSS score for CVE-2026-6019?

CVE-2026-6019 has an EPSS score of 0.23% (14th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-6019?

Upgrade python3 on rhel 8 to 12-main@x86_64 or later. Fixes are available for 44 affected products.

CVE & CISA-KEV Catalog

CVE-2026-6019

LOW

6.1

CVSS v3

NVD

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.

CWE-150 CWE-116

How to fix

Remediation Available

python3Red Hat / RHEL

Fixed in:12-main@x86_64RHSA-2026:32980

Fixed in:13-main@aarch64RHSA-2026:32997

Fixed in:11-main@x86_64RHSA-2026:33885

Fixed in:12-main@aarch64RHSA-2026:32980

Fixed in:11-main@srcRHSA-2026:33885

Fixed in:11-main@aarch64RHSA-2026:33885

Fixed in:12-main@srcRHSA-2026:32980

Fixed in:13-main@srcRHSA-2026:32997

Fixed in:13-main@x86_64RHSA-2026:32997

python3Rocky

Fixed in:11-main@x86_64RHSA-2026:33885

Fixed in:13-main@srcRHSA-2026:32997

Fixed in:12-main@x86_64RHSA-2026:32980

Fixed in:13-main@aarch64RHSA-2026:32997

Fixed in:11-main@aarch64RHSA-2026:33885

Fixed in:13-main@x86_64RHSA-2026:32997

Fixed in:12-main@aarch64RHSA-2026:32980

Fixed in:12-main@srcRHSA-2026:32980

Fixed in:11-main@srcRHSA-2026:33885

python3.14Rocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14Red Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-debugRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-debugRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-debuginfoRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-debuginfoRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-debugsourceRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-debugsourceRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-develRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-develRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreadingRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreadingRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-debugRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-debugRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-develRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-develRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-idleRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-idleRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-libsRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-libsRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-testRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-testRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-tkinterRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-freethreading-tkinterRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-idleRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-idleRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-libsRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-libsRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-testRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-testRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-tkinterRocky

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

python3.14-tkinterRed Hat / RHEL

Fixed in:0:3.14.5-1.el10_2RHSA-2026:28581

Fixed in:0:3.14.5-1.el9_8RHSA-2026:28247

libpython3.10Ubuntu

Fixed in:3.10.12-1~22.04.16USN-8509-1

libpython3.12t64Ubuntu

Fixed in:3.12.3-1ubuntu0.15USN-8509-1

python3.10Ubuntu

Fixed in:3.10.12-1~22.04.16USN-8509-1

python3.12Ubuntu

Fixed in:3.12.3-1ubuntu0.15USN-8509-1

Python 2Windows application

Affected:3.15.0Fixed in:3.15.0Python Software Foundation

Python 3.10Windows application

Affected:3.15.0Fixed in:3.15.0Python Software Foundation

Python 3.11Windows application

Affected:3.15.0Fixed in:3.15.0Python Software Foundation

Python 3.12Windows application

Affected:3.15.0Fixed in:3.15.0Python Software Foundation

Python 3.8Windows application

Affected:3.15.0Fixed in:3.15.0Python Software Foundation

Python 3.9Windows application

Affected:3.15.0Fixed in:3.15.0Python Software Foundation

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

0.23%probability of exploitation in 30 days

14thpercentile

Low risk: more likely to be exploited than 14% of all known CVEs.

References

Patch4

Exploit1

github.com

Vendor Advisory1

mail.python.org

Related Vulnerabilities

Other CWE-150 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-0899	Critical	9.8	11%	-	Fix
CVE-2025-55754	Critical	9.6	9.9%	-	Fix
CVE-2021-25310	High	8.8	4.6%	-	-
CVE-2020-6932	Critical	10.0	3.6%	-	-
CVE-2024-28085	Low	3.3	2.2%	-	Fix
CVE-2022-30123	Critical	10.0	1.8%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-28.