In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path…
Priority LOW 37CWE-159Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 9 fixed, 5 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characters.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00246 15th percentileScored 2026-11-07
Fix Partial Tornado (tornadoweb): 6.5.5tornado (PyPI): 6.5.5Red Hat: 12 advisoriesRed Hat: 9 fixed, 5 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| tornadoweb | Tornado | before 6.5.5 | 6.5.5 | Patch available | CNA |
| — | tornado (PyPI) | before 6.5.5 | 6.5.5 | Patch available | GHSA-fqwm-6jpj-5wxc |
- Tornado Vendortornadoweb Affected before 6.5.5 Fixed in 6.5.5 Patch available CNA
- tornado (PyPI) Vendor— Affected before 6.5.5 Fixed in 6.5.5 Patch available GHSA-fqwm-6jpj-5wxc
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:tornadoweb:tornado:*:*:*:*:*:*:*:* | before 6.5.5 | Vulnerable | tornadoweb |
- cpe:2.3:a:tornadoweb:tornado:*:*:*:*:*:*:*:* Versions before 6.5.5 Vulnerable ·tornadoweb
Remediation
- Fix · CNA Tornado (tornadoweb) Fixed in 6.5.5
- Fix · GHSA-fqwm-6jpj-5wxc tornado (PyPI) Fixed in 6.5.5 Advisory →
Red Hat 12 advisories
- RHSA-2026:73987 Released 2026-09-30 · Red Hat rating CriticalRHOAI 3.3.7 - Red Hat OpenShift AI
- Red Hat OpenShift AI 3.3 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9, registry.redhat.io/rhoai/odh-data-science-pipelines-argo-argoexec-rhel9 +47
- RHSA-2026:65126 Released 2026-09-08 · Red Hat rating ImportantRHOAI 2.25.11 - Red Hat OpenShift AI
- Red Hat OpenShift AI 2.25 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-caikit-tgis-serving-rhel9, registry.redhat.io/rhoai/odh-dashboard-rhel9 +47
- RHSA-2026:37275 Released 2026-07-09 · Red Hat rating CriticalRHOAI 3.3.5 - Red Hat OpenShift AI
- Red Hat OpenShift AI 3.3 registry.redhat.io/rhoai/odh-dashboard-rhel9, registry.redhat.io/rhoai/odh-data-science-pipelines-operator-controller-rhel9, registry.redhat.io/rhoai/odh-feast-operator-rhel9 +45
Show 9 more Red Hat advisories
- RHSA-2026:24342 Released 2026-06-08 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) python-tornado-4.2.1-5.el7_9.3, python-tornado-doc-4.2.1-5.el7_9.3
- RHSA-2026:20810 Released 2026-05-26 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream EUS (v.9.4) python-tornado-6.4.2-1.el9_4.2, python3-tornado-6.4.2-1.el9_4.2
- RHSA-2026:20572 Released 2026-05-26 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream EUS (v.9.6) python-tornado-6.4.2-2.el9_6.3, python3-tornado-6.4.2-2.el9_6.3
- RHSA-2026:20577 Released 2026-05-26 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) python-tornado-6.4.2-1.el10_0.2, python3-tornado-6.4.2-1.el10_0.2
- RHSA-2026:20573 Released 2026-05-26 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) python-tornado-6.4.2-1.el9_2.2, python3-tornado-6.4.2-1.el9_2.2
- RHSA-2026:19189 Released 2026-05-19 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream (v. 9) python-tornado-6.5.5-1.el9_8, python3-tornado-6.5.5-1.el9_8
- RHSA-2026:19034 Released 2026-05-19 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream (v. 10) python-tornado-6.5.5-1.el10_2, python3-tornado-6.5.5-1.el10_2
- RHSA-2026:13670 Released 2026-05-05 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream (v. 9) python-tornado-6.5.5-1.el9_7.1, python3-tornado-6.5.5-1.el9_7.1
- RHSA-2026:13641 Released 2026-05-05 · Red Hat rating Moderatepython-tornado security update
- Red Hat Enterprise Linux AppStream (v. 10) python-tornado-6.5.5-1.el10_1.1, python3-tornado-6.5.5-1.el10_1.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| External Secrets Operator for Red Hat OpenShift | Affected | No fix yet |
| Lightspeed Core | Affected | No fix yet |
| OpenShift Lightspeed | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:13641, RHSA-2026:19034 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:13670, RHSA-2026:19189 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:20573 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:20577 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2026:20810 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:20572 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:24342 |
| Red Hat OpenShift AI 2.25 | Fixed | RHSA-2026:65126 |
| Red Hat OpenShift AI 3.3 | Fixed | RHSA-2026:37275, RHSA-2026:73987 |
Not affected: 6 products
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift AI 2.25
- Red Hat OpenShift AI 3.3
- Red Hat OpenShift Container Platform 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-35536
- 2026-10-03 Alias added: GHSA-fqwm-6jpj-5wxc
- 2026-10-07 Fix available: RHSA-2026:73987 · Red Hat
- 2026-10-16 Affected versions changed · Red Hat
References
More tornadoweb Tornado vulnerabilities
- TI-2026-24502 Tornado has a DoS due to too many multipart parts CVSS 4.0HIGH 8.7
- TI-2024-35317 Tornado has HTTP cookie parsing DoS vulnerability CVSS 3.1HIGH 7.5
- TI-2025-41422 Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters CVSS 3.1HIGH 7.5
- TI-2025-41421 Tornado is Vulnerable to Quadratic DoS via Repeated Header Coalescing CVSS 3.1HIGH 7.5
- TI-2025-29817 Tornado vulnerable to excessive logging caused by malformed multipart form data CVSS 3.1HIGH 7.5
- TI-2014-07904 Tornado before 3.2.2 sends arbitrary responses that contain a fixed CSRF token and may be… CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-35536 · CVE Program
- CVE-2026-35536 · NVD
- FIRST EPSS
- GHSA-fqwm-6jpj-5wxc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-35536 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences