CVE-2026-6019
No exploitation reported by the sources we read.
- Published2026-04-22
- Fixed in3.14.5 · 3.13.14
- WeaknessCWE-116 · CWE-150
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2026-04-2220:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-24 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6019?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6019?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV · NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.14 | ≥ 3.14.0, < 3.14.5 | 3.14.5 | OSV |
| 3.13 | < 3.13.14 | 3.13.14 | NVD · OSV |
| 3.14 | ≥ 3.14.0, ≤ 3.14.4 | no fix published | NVD |
| 3.15 | = 3.15.0 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- python3.14AlmaLinux:10all versions · fixed in 3.14.5-1.el10_2and 13 other packages
- python3.14AlmaLinux:9all versions · fixed in 3.14.5-1.el9_8and 13 other packages
Vendor advisories
python: Python: Cross-Site Scripting (XSS) vulnerability in http.cookies module
python-unversioned-command as a component of Red Hat Enterprise Linux 10 · python3 as a component of Red Hat Enterprise Linux 10 · python3-debug as a component of Red Hat Enterprise Linux 10 · +182 more
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
3 more advisories
Fix
- Update Python to 3.14.5 · 3.13.14
- Vendor fix Red Hat Product Security RHSA-2026:58420 · 15 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
- Vendor fix Red Hat Product Security RHSA-2026:28581 · 73 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
- Workaround from the vendor Red Hat Product Security RHSA-2026:58420 · 15 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
- No fix available, says the vendor Red Hat Product Security CVE-2026-6019 · 185 productsFix deferred
Advisories and patches
- github.comPatch
- github.comPatch
- github.comPatch
- github.comPatch
- mail.python.orgVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionnone2026-04-22
- OpenCVESSVC decisionnone—
- CNACVSS 4.02.1read 2026-10-23
- NVDCVSS 3.16.1read 2026-10-23
- CNAweakness (CWE)CWE-150read 2026-10-23
- NVDweakness (CWE)CWE-116read 2026-10-23
- FIRST EPSSEPSS score0.2 %2026-10-24
- OSVaffected packages—
- Microsoft MSRCadvisory—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CVSS 4.0 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
- Published
- 2026-04-22
- Last Modified
- 2026-07-27
- NVD status
- Analyzed
- MSRC Title
- BaseCookie.js_output() does not neutralize embedded characters
Frequently asked questions
What is CVE-2026-6019?
Is CVE-2026-6019 actively exploited?
What is the CVSS score for CVE-2026-6019?
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Same product first, then the same vendor advisory and the same publication week.