01 Record

CVE-2026-35536

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.

HighPUBLISHEDCNA: mitre

CNA base score7.2 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

View raw JSON

02 Description

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.

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.24% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 15.1% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Analyzed. NVD last modified this record on 2026-07-24.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-04-03 02:25Z6 MO AGO

Last updated

2026-04-03 13:12Z6 MO AGO

Reserved

2026-04-03

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.2)

CNA CVSS vector

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

Weaknesses

CWE-159Improper Handling of Invalid Use of Special ElementsClass
CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')Base

Data version

5.2

Document digest

7f8524ad507e24d4668abb0f333321f8512476e24ee4e792b4198ca0bf653717

05 Affected products

VendorProductVersionsPlatforms

tornadowebTornado0 to < 6.5.5—

06 References

07 Fixed in

AlmaLinux 9

python3-tornado
Fixed

A version is affected if any line below covers it.
- Affected before 6.5.5-1.el9_7.1
- Affected before 6.5.5-1.el9_8

AlmaLinux 10

python3-tornado
Fixed

A version is affected if any line below covers it.
- Affected before 6.5.5-1.el10_1.1
- Affected before 6.5.5-1.el10_2

CloudLinux 9

python3-tornado
Fixed

A version is affected if any line below covers it.
- Affected before 6.5.5-1.el9_7.1
- Affected before 6.5.5-1.el9_8

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

CloudLinux 10

python3-tornado
Fixed

A version is affected if any line below covers it.
- Affected before 6.5.5-1.el10_1.1
- Affected before 6.5.5-1.el10_2

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Debian 12

python-tornado
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

python-tornado
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

python-tornado
Fixed in 6.5.5-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.