Home/CVE/In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .Req
CVE

CVE-2026-35536

In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .Req

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.

HIGH · CVSS 7.2 EPSS 0.00018
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-159Improper Handling of Invalid Use of Special Elements
▤

Affected Products & Versions

1
tornadoweb tornado< 6.5.5
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI tornado HIGH fixed in 6.5.5
▣

Scoring & Timeline

7.2
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Apr 2026 · 04:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

10
usnUSN-8198-2
usnUSN-8198-1
rhsaRHSA-2026:13670Moderate
rhsaRHSA-2026:19034Moderate
rhsaRHSA-2026:19189Moderate
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/tornadoweb/tornado/releases/tag/v6.5.5Product
https://github.com/tornadoweb/tornado/security/advisories/GHSA-78cv-mqj4-43f7Vendor Advisory
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