CVE-2026-6019

LOW

6.1

CVSS v3

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:11-main@x86_64RHSA-2026:33885

Fixed in:11-main@x86_64RHSA-2026:57660

Fixed in:11-main@aarch64RHSA-2026:57660

Fixed in:12-main@srcRHSA-2026:58420

Fixed in:12-main@x86_64RHSA-2026:58420

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

Fixed in:11-main@srcRHSA-2026:57660

Fixed in:12-main@aarch64RHSA-2026:58420

python3Rocky

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

Fixed in:12-main@aarch64RHSA-2026:58420

Fixed in:11-main@aarch64RHSA-2026:57660

Fixed in:11-main@x86_64RHSA-2026:57660

Fixed in:12-main@srcRHSA-2026:58420

Fixed in:12-main@x86_64RHSA-2026:58420

Fixed in:11-main@srcRHSA-2026:57660

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

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

python3.14Rocky

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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-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-libsRocky

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

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

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

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	10%	-	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

Common questions

How do I fix CVE-2026-6019?

Published advisories record a fix for 44 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-6019 being actively exploited?

Not that we know of. CVE-2026-6019 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.23% is the estimated probability that it will be exploited in the next 30 days. That is higher than 14% of all scored CVEs.

How severe is CVE-2026-6019?

CVE-2026-6019 has a CVSS v3 base score of 6.1, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-6019 affect?

Published advisories record a fix for python3 (Red Hat / RHEL), python3 (Rocky), python3.14 (Red Hat / RHEL), python3.14 (Rocky), and 40 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2026-07-27.